GHSA-27QV-W87H-69R6

Vulnerability from github – Published: 2026-08-25 09:30 – Updated: 2026-08-25 09:30
VLAI
Details

The MetForm – Contact Form, Survey, Quiz, & Custom Form Builder for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via 'mf_form_id' Widget Setting in all versions up to, and including, 4.1.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses Elementor's save-time wp_kses_post filter because it contains no HTML tags, and MetForm's own str_replace transformation of script tags into JavaScript template literal expressions provides an additional delivery path.

Severity
6.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
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{
  "affected": [],
  "aliases": [
    "CVE-2026-18100"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-25T08:18:08Z",
    "severity": "MODERATE"
  },
  "details": "The MetForm \u2013 Contact Form, Survey, Quiz, \u0026 Custom Form Builder for Elementor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via \u0027mf_form_id\u0027 Widget Setting in all versions up to, and including, 4.1.8 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The payload bypasses Elementor\u0027s save-time wp_kses_post filter because it contains no HTML tags, and MetForm\u0027s own str_replace transformation of script tags into JavaScript template literal expressions provides an additional delivery path.",
  "id": "GHSA-27qv-w87h-69r6",
  "modified": "2026-08-25T09:30:37Z",
  "published": "2026-08-25T09:30:37Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18100"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/controls/form-picker-utils.php#L45"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/utils/util.php#L605"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.4/widgets/form.php#L143"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/controls/form-picker-utils.php#L45"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/utils/util.php#L605"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/metform/tags/4.1.8/widgets/form.php#L143"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/changeset?reponame=\u0026new=3639278%40metform%2Ftrunk\u0026old=3618333%40metform%2Ftrunk"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/976f1f01-ad5d-413e-a208-ae4b71a61502?source=cve"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ]
}



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