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CVE

CVE-2026-55196

Hermes WebUI < 0.51.409 - Unauthenticated Passkey Registration via Authentication Bypass
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CVE

CVE-2026-55196

Hermes WebUI < 0.51.409 - Unauthenticated Passkey Registration via Authentication Bypass

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 HERMESWEBUIPASSKEY=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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.1
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
-

Related Resources

No items found.

References

https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55196.json, https://github.com/nesquena/hermes-webui/releases/tag/v0.51.442, https://nvd.nist.gov/vuln/detail/CVE-2026-55196, https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-passkey-registration-via-authentication-bypass, https://github.com/nesquena/hermes-webui/pull/4171, https://github.com/nesquena/hermes-webui/pull/4267, https://github.com/nesquena/hermes-webui/commit/4d90577e25d5537cb07290eca3fb8abff3bab316, https://github.com/nesquena/hermes-webui

Severity

0

CVSS Score
0
10

Basic Information

Base CVSS
0
EPSS Probability
0.00579%
EPSS Percentile
0.45202%
Introduced Version
0
Fix Available
4d90577e25d5537cb07290eca3fb8abff3bab316

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