CVE-2026-55196

CriticalCVSS 9.1/10Last modified Sep 17, 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.

Metrics

CVSS 3.1 9.1/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Weakness enumeration

CWE-306

Affected software

Vendor	Product	Versions
hermes-webui	hermes-webui	< 0.51.409

References

Timeline

Published: Jun 17, 2026
Last modified: Sep 17, 2026
NVD status: Deferred

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