GHSA-MWQG-CV4P-5R7G

Vulnerability from github – Published: 2026-08-16 06:30 – Updated: 2026-08-16 06:30
VLAI
Details

The Youtube Showcase plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 4.0.4 via the 'emd_mb_meta' shortcode. This is due to insufficient input sanitization and output escaping on attachment titles referenced by the shortcode's image field: EMD_MB_Helper::image_info() returns the attachment's raw post_title, and EMD_MB_Helper::shortcode() interpolates it into title="%s" HTML attributes via sprintf() without esc_attr(). This makes it possible for authenticated attackers, with author-level access and above (upload_files capability required to create the attachment, edit_posts/publish_posts to embed the shortcode), 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-2026-15790"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-79"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-16T06:16:50Z",
    "severity": "MODERATE"
  },
  "details": "The Youtube Showcase plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 4.0.4 via the \u0027emd_mb_meta\u0027 shortcode. This is due to insufficient input sanitization and output escaping on attachment titles referenced by the shortcode\u0027s image field: EMD_MB_Helper::image_info() returns the attachment\u0027s raw post_title, and EMD_MB_Helper::shortcode() interpolates it into title=\"%s\" HTML attributes via sprintf() without esc_attr(). This makes it possible for authenticated attackers, with author-level access and above (upload_files capability required to create the attachment, edit_posts/publish_posts to embed the shortcode), to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.",
  "id": "GHSA-mwqg-cv4p-5r7g",
  "modified": "2026-08-16T06:30:25Z",
  "published": "2026-08-16T06:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-15790"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/youtube-showcase/tags/4.0.4/assets/ext/emd-meta-box/inc/helpers.php#L274"
    },
    {
      "type": "WEB",
      "url": "https://plugins.trac.wordpress.org/browser/youtube-showcase/tags/4.0.4/assets/ext/emd-meta-box/inc/helpers.php#L72"
    },
    {
      "type": "WEB",
      "url": "https://www.wordfence.com/threat-intel/vulnerabilities/id/3be5e544-1ea5-46f6-a15b-99b0e3718c91?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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