CVE-2026-55196
Hermes WebUI < 0.51.409 - Unauthenticated Passkey Registration via Authentication Bypass
Vexday Risk Score
28Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 9.1EPSS 0.6%KEV nãoPoC —Nuclei —Metasploit —Patch referenciado
Lifecycle
17 Jun 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Affected products
hermes-webui · hermes-webuiWant to know if your infrastructure is exposed to this?
Talk to TrueHacking →References
https://github.com/nesquena/hermes-webui/commit/4d90577e25d5537cb07290eca3fb8abff3bab316https://github.com/nesquena/hermes-webui/pull/4171https://github.com/nesquena/hermes-webui/pull/4267https://github.com/nesquena/hermes-webui/releases/tag/v0.51.442https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-passkey-registration-via-authentication-bypass