{"id":"CVE-2026-42276","state":"PUBLISHED","title":"Onyx: IDOR in /chat/stop-chat-session allows any authenticated user to interrupt other users chat sessions","description":"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.","publishedAt":"2026-05-08T03:49:56.765Z","updatedAt":"2026-05-08T12:57:18.681Z","severity":{"score":4.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["onyx-dot-app onyx"],"affected":[{"vendor":"onyx-dot-app","product":"onyx","versions":[{"version":"< 3.0.9","status":"affected"},{"version":">= 3.1.0, < 3.1.6","status":"affected"},{"version":">= 3.2.0, < 3.2.6","status":"affected"}]}],"references":["https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w"],"weaknesses":["CWE-639"],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/42xxx/CVE-2026-42276.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-42276","state":"PUBLISHED","datePublished":"2026-05-08T03:49:56.765Z","dateUpdated":"2026-05-08T12:57:18.681Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-26T11:53:27.708Z"},"containers":{"cna":{"title":"Onyx: IDOR in /chat/stop-chat-session allows any authenticated user to interrupt other users chat sessions","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"onyx-dot-app","product":"onyx","versions":[{"version":"< 3.0.9","status":"affected"},{"version":">= 3.1.0, < 3.1.6","status":"affected"},{"version":">= 3.2.0, < 3.2.6","status":"affected"}]}],"references":[{"url":"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w","name":"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-639","lang":"en","description":"CWE-639: Authorization Bypass Through User-Controlled Key","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-05-08T03:51:03.272Z"},"source":{"advisory":"GHSA-rw6w-hp62-gc8w","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/onyx-dot-app/onyx/security/advisories/GHSA-rw6w-hp62-gc8w","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-08T12:56:45.370877Z","id":"CVE-2026-42276","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-05-08T12:57:18.681Z"}}]}}}