CVE-2026-55196
Hermes WebUI < 0.51.409 - Unauthenticated Passkey Registration via Authentication Bypass
- State
- Published
- Severity
- 9.1 Critical
- Published
- Jun 17, 2026
- Updated
- Sep 17, 2026
- Reserved
- Jun 16, 2026
Description
Hermes WebUI before 0.51.409 contains an authentication bypass vulnerability in passkey registration endpoints that allows unauthenticated remote attackers to register arbitrary passkeys. When HERMES_WEBUI_PASSKEY=1 is enabled with no existing credentials, POST /api/auth/passkey/register/options and POST /api/auth/passkey/register endpoints are accessible without authentication, allowing attackers to claim the first passkey and gain permanent administrative control.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.1 Critical | CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 9.1 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | VulnCheck |
Weaknesses
- CWE-306 Missing Authentication for Critical Function
Affected Products
| Product | Versions |
|---|---|
hermes-webuihermes-webui |
|
References
- hermes-webui v0.51.442 Release Notesrelease-notes
- Researcher Pull Requestissue-trackingpatch
- Maintainer Pull Requestissue-trackingpatch
- Patch Commitpatch
- https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-passkey-registration-via-authentication-bypassthird-party-advisory
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