CVE-2026-49973
Critical · CVSS 9.4Hermes WebUI — Improper Access Control / Missing Authentication for Critical Function (CWE-306) - Unauthenticated Initial Setup Hijack
- CVSS
- 9.4
- nvd
- EPSS
- —
- KEV
- No
- Class
- oss containerizable
- CWE-306
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.
Search profile — drives PoC discovery
Symbols _set_passwordsettings/api/settingsfirst-runsession cookiepassword hashPOST /settings
Keywords CVE-2026-49973Hermes WebUI unauthenticatedhermes-webui _set_passwordhermes-webui settings API takeoverhermes-webui first-run hijackhermes-webui CWE-306nesquena hermes-webui exploithermes-webui password hijack PoChermes-webui setup bypass
Versions: < 0.51.358
References
- https://github.com/nesquena/hermes-webui/commit/1126e541325d401538f6a272a9c024c37d47ae08
- https://github.com/nesquena/hermes-webui/pull/3964
- https://github.com/nesquena/hermes-webui/pull/3973
- https://github.com/nesquena/hermes-webui/releases/tag/v0.51.358
- https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-password-takeover-via-api-settings
- https://github.com/nesquena/hermes-webui/pull/3964
Status: enriched · ingested 2026-07-15T00:00:20.000Z · profiled 2026-07-15T00:30:20.000Z