{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "0.51.409"
              }
            ],
            "source": [
              "DESCRIPTION",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "b461f2680cea590767920f40ae22e54d9a01b66f"
            },
            {
              "fixed": "4d90577e25d5537cb07290eca3fb8abff3bab316"
            }
          ],
          "repo": "https://github.com/nesquena/hermes-webui",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-306"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55196.json"
  },
  "details": "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.",
  "id": "CVE-2026-55196",
  "modified": "2026-07-16T03:31:08.185565752Z",
  "published": "2026-06-17T17:58:56.543Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/55xxx/CVE-2026-55196.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/nesquena/hermes-webui/releases/tag/v0.51.442"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55196"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/hermes-webui-unauthenticated-passkey-registration-via-authentication-bypass"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nesquena/hermes-webui/pull/4171"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/nesquena/hermes-webui/pull/4267"
    },
    {
      "type": "FIX",
      "url": "https://github.com/nesquena/hermes-webui/commit/4d90577e25d5537cb07290eca3fb8abff3bab316"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/nesquena/hermes-webui"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Hermes WebUI \u003c 0.51.409 - Unauthenticated Passkey Registration via Authentication Bypass"
}