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CVE-2026-55196

Hermes WebUI < 0.51.409 - Unauthenticated Passkey Registration via Authentication Bypass

CVSS 4.0 9.1 CRITICALCVSS 3.1 9.1 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-55196

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-55196

Published

hermes-webui

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "hermes-webui",
                    "product": "hermes-webui",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:github/nesquena/hermes-webui",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThan": "0.51.409"
                        },
                        {
                            "version": "0.51.409",
                            "status": "unaffected",
                            "versionType": "semver"
                        }
                    ],
                    "repo": "https://github.com/nesquena/hermes-webui"
                }

Original source record · Cite this exact observation · Complete original publisher JSON