CVE-2026-55196
Critical · 9.1CVSS
9.1
EPSS
0.8%
Published
Jun 17, 2026
CISA due date
—
The record
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.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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