{"id":"CVE-2026-55604","state":"PUBLISHED","title":"@arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key","description":"DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.7.0, the process-global `SessionStore` accepts caller-supplied `session_id` values without binding them to any authenticated principal or transport session. An attacker can enumerate active session IDs via `deepseek_sessions`, then reuse a victim-controlled `session_id` in `deepseek_chat` to retrieve and continue the victim's conversation context. Version 1.7.0 contains a patch.","publishedAt":"2026-07-09T21:13:15.713Z","updatedAt":"2026-07-10T14:42:09.579Z","severity":{"score":8.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["arikusi deepseek-mcp-server"],"affected":[{"vendor":"arikusi","product":"deepseek-mcp-server","versions":[{"version":">= 1.4.2, < 1.7.0","status":"affected"}]}],"references":["https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578","https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0"],"weaknesses":["CWE-639"],"ingestedAt":"2026-10-29T20:12:24.861Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/55xxx/CVE-2026-55604.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-55604","state":"PUBLISHED","datePublished":"2026-07-09T21:13:15.713Z","dateUpdated":"2026-07-10T14:42:09.579Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-16T23:31:22.445Z"},"containers":{"cna":{"title":"@arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key","descriptions":[{"lang":"en","value":"DeepSeek MCP Server is an MCP server for DeepSeek V4. Starting in version 1.4.2 and prior to version 1.7.0, the process-global `SessionStore` accepts caller-supplied `session_id` values without binding them to any authenticated principal or transport session. An attacker can enumerate active session IDs via `deepseek_sessions`, then reuse a victim-controlled `session_id` in `deepseek_chat` to retrieve and continue the victim's conversation context. Version 1.7.0 contains a patch."}],"affected":[{"vendor":"arikusi","product":"deepseek-mcp-server","versions":[{"version":">= 1.4.2, < 1.7.0","status":"affected"}]}],"references":[{"url":"https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578","name":"https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0","name":"https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":8.6,"baseSeverity":"HIGH","confidentialityImpact":"HIGH","integrityImpact":"LOW","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/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":"2026-07-09T21:13:15.713Z"},"source":{"advisory":"GHSA-fh3r-g96v-f578","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-10T14:40:34.870840Z","id":"CVE-2026-55604","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-10T14:42:09.579Z"}}]}}}