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CVE-2026-42276

Onyx is an open-source AI platform. Prior to versions 3.0.9, 3.1.6, and 3.2.6, the POST /chat/stop-chat-session/{chat_session_id} endpoint lets any authenticated user stop any other user's active chat session. The endpoint checks authentication but never verifies the session belongs to the caller. An attacker who knows a chat session UUID can kill another user's LLM generation mid-stream. This issue has been patched in versions 3.0.9, 3.1.6, and 3.2.6.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:86c0bbf3b3049f78452e120549fe1aab11c94532942d40e5e4e30aefad110135
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"onyx","vendor":"onyx-dot-app","versions":[{"status":"affected","version":"< 3.0.9"},{"status":"affected","version":">= 3.1.0, < 3.1.6"},{"status":"affected","version":">= 3.2.0, < 3.2.6"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:4af70577314d8a0b6175ac4dc9be63238179305f6501ee10886680c301d264bc · sha256:d5a04bcdbc30889e… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":4.3,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:4af70577314d8a0b6175ac4dc9be63238179305f6501ee10886680c301d264bc · sha256:d5a04bcdbc30889e… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-639","description":"CWE-639: Authorization Bypass Through User-Controlled Key","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:4af70577314d8a0b6175ac4dc9be63238179305f6501ee10886680c301d264bc · sha256:d5a04bcdbc30889e… · /containers/cna/problemTypes/0/descriptions/0

Source references

2 source assertions
{"tags":["exploit"],"url":"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4af70577314d8a0b6175ac4dc9be63238179305f6501ee10886680c301d264bc · sha256:d5a04bcdbc30889e… · /containers/adp/0/references/0
{"name":"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w","tags":["x_refsource_CONFIRM"],"url":"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:4af70577314d8a0b6175ac4dc9be63238179305f6501ee10886680c301d264bc · sha256:d5a04bcdbc30889e… · /containers/cna/references/0

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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