Vulnerability details
CVE-2026-55196
hermes-webui hermes-webui
Hermes WebUI < 0.51.409 - Unauthenticated Passkey Registration via Authentication Bypass
CVSS 4.0
9.1Critical
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 9.1Critical | 4.0 | CVEProject cvelistV5 (CNA) (VulnCheck) | 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 |
| 9.1Critical | 3.1 | CVEProject cvelistV5 (CNA) (VulnCheck) | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| hermes-webui | hermes-webui | v < 0.51.409 | CVEProject cvelistV5 (CNA) |
References and advisories
5- https://github.com/nesquena/hermes-webui/releases/tag/v0.51.442 release-notes
- https://github.com/nesquena/hermes-webui/pull/4171 issue-trackingpatch
- https://github.com/nesquena/hermes-webui/pull/4267 issue-trackingpatch
- https://github.com/nesquena/hermes-webui/commit/4d90577e25d5537cb07290eca3fb8abff3bab316 patch
- https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-passkey-registration-via-authentication-bypass third-party-advisory
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Details
- Published
- 2026-06-17
- Last updated
- 2026-09-17
- State
- Published
- Assigner (CNA)
- VulnCheck
Exploit prediction (EPSS)
0.57%
Probability of exploitation in 30 days
47.8%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-306Missing Authentication for Critical Function