{"id":"CVE-2026-49973","aliases":["EUVD-2026-36306","GHSA-p52p-4vmg-4vq3"],"status":"published","title":"Hermes WebUI \u003c 0.51.358 Unauthenticated Password Takeover via /api/settings","description":"Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.","severity":{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-09","score":0.00543,"percentile":0.45909,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-306"],"published":"2026-06-11T19:04:08Z","modified":"2026-11-09T02:47:15Z","products":[{"vendor":"nesquena","product":"hermes-webui"}],"references":[{"url":"https://github.com/nesquena/hermes-webui/releases/tag/v0.51.358","tags":["release-notes","advisory"]},{"url":"https://github.com/nesquena/hermes-webui/pull/3964","tags":["issue-tracking","patch","exploit","fix"]},{"url":"https://github.com/nesquena/hermes-webui/pull/3973","tags":["issue-tracking","patch","fix"]},{"url":"https://github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08","tags":["patch","fix"]},{"url":"https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settings","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-49973","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-p52p-4vmg-4vq3"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/49xxx/CVE-2026-49973.json","tags":["advisory"]},{"url":"https://github.com/nesquena/hermes-webui","tags":["package"]}],"sources":{"cve":[{"id":"CVE-2026-49973","title":"Hermes WebUI \u003c 0.51.358 Unauthenticated Password Takeover via /api/settings","description":"Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.","status":"published","published":"2026-06-11T19:04:08.505Z","modified":"2026-11-08T14:05:00.824Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical","assessor":"cna"},{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical","assessor":"cna"}],"cwes":["CWE-306"],"updated_at":"2026-11-08T15:43:33.322657Z"}],"euvd":[{"id":"EUVD-2026-36306","description":"Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.","status":"published","published":"2026-06-11T19:04:08Z","modified":"2026-11-08T14:05:00Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical"}],"updated_at":"2026-11-08T15:13:08.252361Z"}],"ghsa":[{"id":"GHSA-p52p-4vmg-4vq3","title":"Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that...","description":"Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.","status":"published","published":"2026-06-11T21:31:57Z","modified":"2026-06-11T21:32:03Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/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":"critical"},{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T15:08:44.492605Z"}],"nvd":[{"id":"CVE-2026-49973","description":"Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.","status":"published","published":"2026-06-11T20:16:25.05Z","modified":"2026-10-26T11:10:00.157Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/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":"critical","assessor":"secondary"},{"version":"3.1","score":9.4,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L","level":"critical","assessor":"secondary"}],"cwes":["CWE-306"],"updated_at":"2026-11-02T14:12:23.485267Z"}],"osv":[{"id":"CVE-2026-49973","title":"Hermes WebUI \u003c 0.51.358 Unauthenticated Password Takeover via /api/settings","description":"Hermes WebUI before version 0.51.358 contains an improper access control vulnerability that allows unauthenticated remote attackers to hijack initial setup by submitting the _set_password parameter to the settings API endpoint without any network origin restriction. Attackers on any reachable network can send a POST request to the settings endpoint during the first-run setup window to persist an arbitrary password hash, obtain a valid session cookie, and lock out the legitimate operator from their own instance.","status":"published","published":"2026-06-11T19:04:08.505Z","modified":"2026-11-09T02:47:15.269364263Z","cvss":[{"version":"4.0","score":9.2,"vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:L/SC:N/SI:N/SA:N","level":"critical"}],"cwes":["CWE-306"],"updated_at":"2026-11-09T03:16:24.800471Z"}]}}