GHSA-X84M-MWH2-95QM

Vulnerability from github – Published: 2026-06-02 09:36 – Updated: 2026-06-02 09:36
VLAI
Details

The ZeM STL plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the [zemstl] shortcode in all versions up to and including 1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes, specifically the 'url', 'color', and 'bgcolor' parameters. These attribute values are directly interpolated into HTML attribute context without being passed through esc_attr() or any other escaping function. 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.

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-2026-4081"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-02T09:16:16Z",
    "severity": "MODERATE"
  },
  "details": "The ZeM STL plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the [zemstl] shortcode in all versions up to and including 1.0. This is due to insufficient input sanitization and output escaping on user-supplied shortcode attributes, specifically the \u0027url\u0027, \u0027color\u0027, and \u0027bgcolor\u0027 parameters. These attribute values are directly interpolated into HTML attribute context without being passed through esc_attr() or any other escaping function. 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.",
  "id": "GHSA-x84m-mwh2-95qm",
  "modified": "2026-06-02T09:36:15Z",
  "published": "2026-06-02T09:36:15Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-4081"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/zem-stl-viewer/tags/1.0/zemstl.php#L103"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/zem-stl-viewer/tags/1.0/zemstl.php#L104"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/zem-stl-viewer/tags/1.0/zemstl.php#L107"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/zem-stl-viewer/tags/1.0/zemstl.php#L74"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/zem-stl-viewer/trunk/zemstl.php#L103"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/zem-stl-viewer/trunk/zemstl.php#L104"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/zem-stl-viewer/trunk/zemstl.php#L107"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/zem-stl-viewer/trunk/zemstl.php#L74"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/07e415f9-42f1-4c80-a023-38f460f634d3?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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