{"id":"CVE-2026-31950","state":"PUBLISHED","title":"LibreChat's IDOR in SSE Stream Subscription Allows Reading Other Users' Chats","description":"LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE streaming endpoint `/api/agents/chat/stream/:streamId` does not verify that the requesting user owns the stream. Any authenticated user who obtains or guesses a valid stream ID can subscribe and read another user's real-time chat content, including messages, AI responses, and tool invocations. Version 0.8.2 patches the issue.","publishedAt":"2026-03-27T19:25:25.007Z","updatedAt":"2026-03-27T19:55:24.141Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["danny-avila LibreChat"],"affected":[{"vendor":"danny-avila","product":"LibreChat","versions":[{"version":">= 0.8.2-rc2, < 0.8.2","status":"affected"}]}],"references":["https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f6rf-vm44-wh5g"],"weaknesses":["CWE-284"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31950.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31950","state":"PUBLISHED","datePublished":"2026-03-27T19:25:25.007Z","dateUpdated":"2026-03-27T19:55:24.141Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-03-10T15:10:10.657Z"},"containers":{"cna":{"title":"LibreChat's IDOR in SSE Stream Subscription Allows Reading Other Users' Chats","descriptions":[{"lang":"en","value":"LibreChat is a ChatGPT clone with additional features. In versions 0.8.2-rc2 through 0.8.2-rc3, the SSE streaming endpoint `/api/agents/chat/stream/:streamId` does not verify that the requesting user owns the stream. Any authenticated user who obtains or guesses a valid stream ID can subscribe and read another user's real-time chat content, including messages, AI responses, and tool invocations. Version 0.8.2 patches the issue."}],"affected":[{"vendor":"danny-avila","product":"LibreChat","versions":[{"version":">= 0.8.2-rc2, < 0.8.2","status":"affected"}]}],"references":[{"url":"https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f6rf-vm44-wh5g","name":"https://github.com/danny-avila/LibreChat/security/advisories/GHSA-f6rf-vm44-wh5g","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"NONE","baseScore":5.3,"baseSeverity":"MEDIUM","confidentialityImpact":"HIGH","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-284","lang":"en","description":"CWE-284: Improper Access Control","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-03-27T19:26:28.894Z"},"source":{"advisory":"GHSA-f6rf-vm44-wh5g","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-27T19:55:17.212435Z","id":"CVE-2026-31950","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":"2026-03-27T19:55:24.141Z"}}]}}}