GHSA-P38J-G4G4-FM3G

Vulnerability from github – Published: 2026-10-10 09:30 – Updated: 2026-10-10 09:30
VLAI
Details

The WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) plugin for WordPress is vulnerable to Authentication Bypass via OIDC Nonce Replay in all versions up to, and including, 44.1 This is due to Id_Token_Service_Deprecated::process_openidconnect_token() using the incompatible WordPress core wp_verify_nonce() function to validate a nonce produced by Nonce_Service::create_nonce() — a 64-character hex value that wp_verify_nonce() can never successfully verify — causing the nonce check to silently fail without terminating authentication, so execution continues into authenticate_oidc_user() with the attacker-supplied id_token. This makes it possible for unauthenticated attackers who have obtained a previously-issued, valid id_token for a target account to replay that token and authenticate as any WordPress user, including administrators, resulting in full site takeover. This vulnerability is only exploitable when the use_id_token_parser_v2 plugin option is enabled, as this is the configuration that routes token processing through the deprecated parser containing the broken nonce check.

Severity
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-104759"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-10T08:17:04Z",
    "severity": "HIGH"
  },
  "details": "The WPO365 | SEAMLESS WORDPRESS + MICROSOFT INTEGRATION (WPO365 | LOGIN) plugin for WordPress is vulnerable to Authentication Bypass via OIDC Nonce Replay in all versions up to, and including, 44.1 This is due to `Id_Token_Service_Deprecated::process_openidconnect_token()` using the incompatible WordPress core `wp_verify_nonce()` function to validate a nonce produced by `Nonce_Service::create_nonce()` \u2014 a 64-character hex value that `wp_verify_nonce()` can never successfully verify \u2014 causing the nonce check to silently fail without terminating authentication, so execution continues into `authenticate_oidc_user()` with the attacker-supplied `id_token`. This makes it possible for unauthenticated attackers who have obtained a previously-issued, valid `id_token` for a target account to replay that token and authenticate as any WordPress user, including administrators, resulting in full site takeover. This vulnerability is only exploitable when the `use_id_token_parser_v2` plugin option is enabled, as this is the configuration that routes token processing through the deprecated parser containing the broken nonce check.",
  "id": "GHSA-p38j-g4g4-fm3g",
  "modified": "2026-10-10T09:30:28Z",
  "published": "2026-10-10T09:30:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-104759"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Id_Token_Service.php#L107"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Id_Token_Service_Deprecated.php#L110"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Nonce_Service.php#L72"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/wpo365-login/tags/44.1/Services/Router_Service.php#L275"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset/3727410/wpo365-login"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3727410%40wpo365-login%2Ftags%2F45.0\u0026old=3682496%40wpo365-login%2Ftags%2F44.1"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/aad7ddac-ed12-4263-8e68-64b1fca8dfad?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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