{"id":"CVE-2026-55197","title":"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","summary":"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 direc…","severity":"medium","cvss":6.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N","cwe":["CWE-639"],"vendor":"nesquena","product":"hermes-webui","affected":["hermes-webui < 0.51.443"],"published":"2026-06-17","updated":"2026-09-17","sourceUpdated":"2026-09-17T18:16:48.510","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-55197","references":[{"url":"https://github.com/nesquena/hermes-webui/commit/2a3baa71b81ca92da8ece8616a09f15894beec71","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nesquena/hermes-webui/pull/3982","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nesquena/hermes-webui/pull/4269","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nesquena/hermes-webui/releases/tag/v0.51.443","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/hermes-webui-broken-access-control-in-api-session-endpoint","label":"disclosure@vulncheck.com"},{"url":"https://github.com/nesquena/hermes-webui/pull/3982","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"}],"tags":["nvd","cve.org","exploit-available"],"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"partial","timestamp":"2026-06-17T18:51:32.010912Z"},"epss":0.00272,"epssPercentile":0.19803,"ingestedAt":"2026-09-17T18:25:15.970Z","slug":"CVE-2026-55197","body":"## Overview\n\nHermes 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=<foreign_id>&messages=1 to retrieve unauthorized conversation transcripts and metadata.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":35.8,"likelihood":0.1,"exploitation":12,"ransomware":0},"changes":[]}