{"id":"CVE-2026-55197","aliases":["EUVD-2026-37778","GHSA-5wqv-fhmr-pjgh"],"status":"published","title":"Hermes WebUI \u003c 0.51.443 - Broken Access Control in /api/session Endpoint","description":"Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET /api/session?session_id=\u003cforeign_id\u003e\u0026messages=1 to retrieve unauthorized conversation transcripts and metadata.","severity":{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00346,"percentile":0.28395,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-639"],"published":"2026-06-17T17:59:10Z","modified":"2026-10-28T02:30:57Z","products":[{"vendor":"nesquena","product":"hermes-webui"}],"references":[{"url":"https://github.com/nesquena/hermes-webui/releases/tag/v0.51.443","tags":["release-notes","advisory"]},{"url":"https://github.com/nesquena/hermes-webui/pull/3982","tags":["issue-tracking","patch","exploit","fix"]},{"url":"https://github.com/nesquena/hermes-webui/pull/4269","tags":["issue-tracking","patch","fix"]},{"url":"https://github.com/nesquena/hermes-webui/commit/2a3baa71b81ca92da8ece8616a09f15894beec71","tags":["patch","fix"]},{"url":"https://www.vulncheck.com/advisories/hermes-webui-broken-access-control-in-api-session-endpoint","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-55197","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-5wqv-fhmr-pjgh"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55197.json","tags":["advisory"]},{"url":"https://github.com/nesquena/hermes-webui","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-55197","title":"Hermes WebUI \u003c 0.51.443 - Broken Access Control in /api/session Endpoint","description":"Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET /api/session?session_id=\u003cforeign_id\u003e\u0026messages=1 to retrieve unauthorized conversation transcripts and metadata.","status":"published","published":"2026-06-17T17:59:10.933Z","modified":"2026-09-17T18:57:21.59Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high","assessor":"cna"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:20:11.925815Z"}],"euvd":[{"id":"EUVD-2026-37778","description":"Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET /api/session?session_id=\u003cforeign_id\u003e\u0026messages=1 to retrieve unauthorized conversation transcripts and metadata.","status":"published","published":"2026-06-17T17:59:10Z","modified":"2026-09-17T18:57:21Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"updated_at":"2026-11-02T17:28:10.38936Z"}],"ghsa":[{"id":"GHSA-5wqv-fhmr-pjgh","title":"Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session...","description":"Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET /api/session?session_id=\u003cforeign_id\u003e\u0026messages=1 to retrieve unauthorized conversation transcripts and metadata.","status":"published","published":"2026-06-17T21:34:38Z","modified":"2026-06-17T21:34:45Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T15:08:52.922102Z"}],"nvd":[{"id":"CVE-2026-55197","description":"Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET /api/session?session_id=\u003cforeign_id\u003e\u0026messages=1 to retrieve unauthorized conversation transcripts and metadata.","status":"published","published":"2026-06-17T19:18:13.34Z","modified":"2026-10-26T11:10:00.157Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"high","assessor":"secondary"},{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T14:12:24.544761Z"}],"osv":[{"id":"CVE-2026-55197","title":"Hermes WebUI \u003c 0.51.443 - Broken Access Control in /api/session Endpoint","description":"Hermes WebUI before 0.51.443 contains a broken access control vulnerability in the /api/session endpoint that allows authenticated users to disclose cross-profile session transcripts. Attackers can bypass profile boundary checks by directly querying session IDs belonging to other profiles via GET /api/session?session_id=\u003cforeign_id\u003e\u0026messages=1 to retrieve unauthorized conversation transcripts and metadata.","status":"published","published":"2026-06-17T17:59:10.933Z","modified":"2026-10-28T02:30:57.334102316Z","cvss":[{"version":"4.0","score":7.1,"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"high"}],"cwes":["CWE-639"],"updated_at":"2026-11-02T15:45:11.22012Z"}]}}