{"id":"CVE-2026-55604","summary":"@arikusi/deepseek-mcp-server has an Authorization Bypass Through User-Controlled Key","details":"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.","aliases":["GHSA-fh3r-g96v-f578"],"modified":"2026-07-15T01:48:58.875642569Z","published":"2026-07-09T21:13:15.713Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55604.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-639"]},"references":[{"type":"WEB","url":"https://github.com/arikusi/deepseek-mcp-server/releases/tag/v1.7.0"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55604.json"},{"type":"ADVISORY","url":"https://github.com/arikusi/deepseek-mcp-server/security/advisories/GHSA-fh3r-g96v-f578"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55604"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/arikusi/deepseek-mcp-server","events":[{"introduced":"1f90faae26935a7c16efaaf7e8251d551efae2c0"},{"fixed":"9fd514292d23d59ca1434b01f019aca6ef4356f9"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"1.4.2"},{"fixed":"1.7.0"}]}}],"versions":["v1.6.0","v1.5.2","v1.5.1","v1.5.0","v1.4.3","v1.4.2"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-55604.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L"}]}