Oa Public— agent skill

Oa Public — independently scanned and version-tracked by SaferSkills.

by OpenAgenda·Agent Skill·github.com/OpenAgenda/oa-public

Is Oa Public safe to install?

SaferSkills independently audited Oa Public (Agent Skill) and scored it 45/100 (orange). The audit ran 55 deterministic rules across Security, Supply Chain, Maintenance, Transparency, and Community; it found 21 high-severity and 0 lower-severity findings. The full rule-by-rule trace and per-finding evidence are below. Free, methodology-open.

Score
45/100
●●●●●○○○○○
↑ +0 since first scan (45 → 45)Re-scan~30s
Latest scan
ScannedJun 23, 2026 · 34d ago
Scans run1 over 90 days
Detectors55 checks · 5 categories
Findings0 warnings · 21 high
EngineSaferSkills 2b638c6
View methodology →
SaferSkills installs
This week0
This month0
All time0
CategoryWeightCategory scoreContribution
Securityprompt, exec, net, exfil, eval
35%
0
0.0 pts
Supply chainhash, typosquat, maintainer, lockfile
20%
100
20.0 pts
Maintenancestaleness, pinning, CI
15%
100
15.0 pts
TransparencySKILL.md, perms, README
15%
100
15.0 pts
Communityinstalls, verify, response
15%
100
15.0 pts

Findings & checks · 21 flagged

Securityscore 0 · 21 findings
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/404LocationImage.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/404LocationImage.json· json
1615"title": "Espace Services Séniors",
1616"url": "http://www.espace-services-seniors.fr",
1617"_agg": "eyJ1aWQiOjMyMzUwMzY5LCJ0aXRsZSI6IkVzcGFjZSBTZXJ2aWNlcyBTw6luaW9ycyIsImltYWdlIjoiYWd
… (102 chars elided on L1617)
1618"uid": 32350369,
1619"createdAt": "2016-12-12T11:12:10.000Z",
Occurrences
1 occurrence · at L1617
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha2568ceda6d342ba05f0rubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/additionalImage.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/additionalImage.json· json
1622"title": "Cité des sciences et de l'industrie",
1623"url": "http://www.cite-sciences.fr",
1624"_agg": "eyJ1aWQiOjc2MTI2ODQyLCJ0aXRsZSI6IkNpdMOpIGRlcyBzY2llbmNlcyBldCBkZSBsJ2luZHVzdHJpZSI
… (102 chars elided on L1624)
1625"uid": 76126842,
1626"createdAt": "2018-09-08T14:08:03.000Z",
Occurrences
1 occurrence · at L1624
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha25646de4b6a2a660991rubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/bdxVillesMobiles.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/bdxVillesMobiles.json· json
34"slug": "archives-bordeaux-metropole",
35"url": "http://archives.bordeaux-metropole.fr/",
36"_agg": "eyJ1aWQiOjcwMTczOTQ0LCJ0aXRsZSI6IkFyY2hpdmVzIGRlIEJvcmRlYXV4IE3DqXRyb3BvbGUiLCJpbWF
… (102 chars elided on L36)
37},
38"sourceAgendas": [
Occurrences
1 occurrence · at L36
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha25648ef5d403c86813brubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/begles.event.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/begles.event.json· json
31"title": "Estey",
32"url": "https://estey.mairie-begles.fr",
33"_agg": "eyJ1aWQiOjE1MzIyMTc0LCJ0aXRsZSI6IkVzdGV5IiwiaW1hZ2UiOiJhZ2VuZGExNTMyMjE3NC5qcGc/X19
… (104 chars elided on L33)
34"uid": 15322174,
35"createdAt": "2021-07-02T09:26:25.000Z",
Occurrences
1 occurrence · at L33
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha25649e74cd7df332bfbrubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/bunkers.event.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/bunkers.event.json· json
43"slug": "jep-2025-pays-de-la-loire",
44"url": "https://journeesdupatrimoine.culture.gouv.fr",
45"_agg": "eyJ1aWQiOjgxMTA1NjksInRpdGxlIjoiSm91cm7DqWVzIGV1cm9ww6llbm5lcyBkdSBwYXRyaW1vaW5lIDI
… (104 chars elided on L45)
46},
47"sourceAgendas": [],
Occurrences
1 occurrence · at L45
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha256141789a9a696f674rubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/detailedLocation.event.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/detailedLocation.event.json· json
31"slug": "ndm-2025-pays-de-la-loire",
32"url": "https://www.nuitdesmusees.fr",
33"_agg": "eyJ1aWQiOjk0OTE0MzEsInRpdGxlIjoiTnVpdCBldXJvcMOpZW5uZSBkZXMgbXVzw6llcyAyMDI1IDogUGF
… (104 chars elided on L33)
34},
35"sourceAgendas": [],
Occurrences
1 occurrence · at L33
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha256eb73980fd3f91eccrubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/gouton.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/gouton.json· json
1179"title": "Senlis",
1180"url": "https://www.ville-senlis.fr/",
1181"_agg": "eyJ1aWQiOjU2MTcwNDczLCJ0aXRsZSI6IlNlbmxpcyIsImltYWdlIjoiYWdlbmRhNTYxNzA0NzMuanBnP19
… (99 chars elided on L1181)
1182"uid": 56170473,
1183"createdAt": "2022-01-10T17:56:31.000Z",
Occurrences
1 occurrence · at L1181
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha2566109b7122d64cdd0rubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/grimaces.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/grimaces.json· json
31"slug": "musee-de-carouge-geneve",
32"url": "https://www.carouge.ch/musee",
33"_agg": "eyJ1aWQiOjUwMjYxNTYzLCJ0aXRsZSI6Ik11c8OpZSBkZSBDYXJvdWdlIC0gR2Vuw6h2ZSIsImltYWdlIjo
… (104 chars elided on L33)
34},
35"sourceAgendas": [
Occurrences
1 occurrence · at L33
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha256381cc2393b48abeerubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/intrepides.event.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/intrepides.event.json· json
47"title": "Offre de \"Colos apprenantes\" - Saône-et-Loire",
48"url": "https://openagenda.com/agendas?search=Offre+de+%22Colos+apprenantes%22",
49"_agg": "eyJ1aWQiOjEwOTcyMjI0LCJ0aXRsZSI6Ik9mZnJlIGRlIFwiQ29sb3MgYXBwcmVuYW50ZXNcIiAtIFNhw7R
… (104 chars elided on L49)
50"uid": 10972224,
51"createdAt": "2020-09-23T14:26:20.000Z",
Occurrences
1 occurrence · at L49
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha2567977bf0b0b77d345rubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/oiseaux-de-nuit.event.json×2
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/oiseaux-de-nuit.event.json· json
33"slug": "musee-lam",
34"url": "http://www.musee-lam.fr/",
35"_agg": "eyJ1aWQiOjUxMzAyMTQ5LCJ0aXRsZSI6IkxhTSIsImltYWdlIjoiYWdlbmRhNTEzMDIxNDkuanBnIiwidXJ
… (66 chars elided on L35)
36},
37"sourceAgendas": [
Occurrences
2 occurrences · first at L35, also L47
Show all 2 locations
Line
File
L35
pdf-exports/event/test/fixtures/oiseaux-de-nuit.event.json
L47
pdf-exports/event/test/fixtures/oiseaux-de-nuit.event.json
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha256e7a90973cb47e309rubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/onlineAttendance.event.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/onlineAttendance.event.json· json
31"slug": "pci-corse",
32"url": "https://immateriel.culture.gouv.fr",
33"_agg": "eyJ1aWQiOjIwMTY5NywidGl0bGUiOiJWaXZyZSBsZSBwYXRyaW1vaW5lIGN1bHR1cmVsIGltbWF0w6lyaWV
… (104 chars elided on L33)
34},
35"sourceAgendas": [],
Occurrences
1 occurrence · at L33
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha256643e86fd4f9c4b0erubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/quinzaine.event.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/quinzaine.event.json· json
31"slug": "quinzaine-commerce-equitable",
32"url": "https://www.quinzaine-commerce-equitable.org/decouvrir-les-evenements",
33"_agg": "eyJ1aWQiOjYzMjIyMDMyLCJ0aXRsZSI6IlF1aW56YWluZSBkdSBjb21tZXJjZSDDqXF1aXRhYmxlIiwiaW1
… (104 chars elided on L33)
34},
35"sourceAgendas": [],
Occurrences
1 occurrence · at L33
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha256846de6ef4795da4frubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/rodin-bourdelle.event.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/rodin-bourdelle.event.json· json
31"slug": "la-piscine-roubaix",
32"url": "http://www.roubaix-lapiscine.com/",
33"_agg": "eyJ1aWQiOjc5MDE3MzQzLCJ0aXRsZSI6IkxhIFBpc2NpbmUgLSBSb3ViYWl4IiwiaW1hZ2UiOiJodHRwczo
… (104 chars elided on L33)
34},
35"sourceAgendas": [],
Occurrences
1 occurrence · at L33
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha256aa775ee9d66c5b73rubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/suzanne.event.json×3
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/suzanne.event.json· json
32"slug": "musba_bordeaux",
33"url": "https://www.musba-bordeaux.fr/",
34"_agg": "eyJ1aWQiOjQxMzI3NzU4LCJ0aXRsZSI6Ik11c8OpZSBkZXMgQmVhdXgtQXJ0cyBCb3JkZWF1eCIsImltYWd
… (104 chars elided on L34)
35},
36"sourceAgendas": [
Occurrences
3 occurrences · first at L34, also L46, L62
Show all 3 locations
Line
File
L34
pdf-exports/event/test/fixtures/suzanne.event.json
L46
pdf-exports/event/test/fixtures/suzanne.event.json
L62
pdf-exports/event/test/fixtures/suzanne.event.json
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha25668526dbf73215041rubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/visite-gratuite.event.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/visite-gratuite.event.json· json
47"title": "Nuit européenne des musées 2025 : Pays de la Loire",
48"url": "https://www.nuitdesmusees.fr",
49"_agg": "eyJ1aWQiOjk0OTE0MzEsInRpdGxlIjoiTnVpdCBldXJvcMOpZW5uZSBkZXMgbXVzw6llcyAyMDI1IDogUGF
… (104 chars elided on L49)
50"uid": 9491431,
51"createdAt": "2025-01-30T11:23:45.000Z",
Occurrences
1 occurrence · at L49
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha2565333eda5c4876f3crubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/withLocationImage.event.json
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/withLocationImage.event.json· json
43"slug": "ndm-2025-pays-de-la-loire",
44"url": "https://www.nuitdesmusees.fr",
45"_agg": "eyJ1aWQiOjk0OTE0MzEsInRpdGxlIjoiTnVpdCBldXJvcMOpZW5uZSBkZXMgbXVzw6llcyAyMDI1IDogUGF
… (104 chars elided on L45)
46},
47"sourceAgendas": [],
Occurrences
1 occurrence · at L45
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha256eb73980fd3f91eccrubric 365aacaView on GitHub
HIGHLong base64-encoded blob hidden in the skill documentationSS-SKILL-INJECT-B64-PAYLOAD-01 · Prompt injection · pdf-exports/event/test/fixtures/withRegistrationLink.event.json×2
HIGHonce decoded by the agent, an encoded payload has the same impact class as plain-text injection.
Why it matters

A base64 string of 128+ characters appears in a documentation file. Encoded prompt injection hides the hostile instruction in base64 — invisible to keyword filters — and relies on the agent's ability to decode it at runtime. There is no normal authoring reason to embed a multi-hundred-byte base64 blob in skill docs.

The exact value spotted
excerptpdf-exports/event/test/fixtures/withRegistrationLink.event.json· json
31"slug": "ville-de-saint-jean-de-braye",
32"url": "https://www.saintjeandebraye.fr/",
33"_agg": "eyJ1aWQiOjgwNjA1ODEzLCJ0aXRsZSI6IlZpbGxlIGRlIFNhaW50LUplYW4gZGUgQnJheWUiLCJpbWFnZSI
… (104 chars elided on L33)
34},
35"sourceAgendas": [
Occurrences
2 occurrences · first at L33, also L45
Show all 2 locations
Line
File
L33
pdf-exports/event/test/fixtures/withRegistrationLink.event.json
L45
pdf-exports/event/test/fixtures/withRegistrationLink.event.json
How to fix
Remove the encoded blob, or decode it and review what it actually contains.
  1. Decode the base64 string and confirm it is not an instruction directed at the agent.
  2. Move any legitimate binary or signature data into a dedicated file (*.sig, SIGNATURES) outside the documentation.
Framework references
OWASPLLM01ATLASAML.T0051
Trace & refs
ruleSS-SKILL-INJECT-B64-PAYLOAD-01sha2560599da2007566363rubric 365aacaView on GitHub
Supply chainscore 100 · 0 findings
All supply chain checks passedNo findings in this category for the latest scan.pass
Maintenancescore 100 · 0 findings
All maintenance checks passedNo findings in this category for the latest scan.pass
Transparencyscore 100 · 0 findings
All transparency checks passedNo findings in this category for the latest scan.pass
Communityscore 100 · 0 findings
All community checks passedNo findings in this category for the latest scan.pass
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