{
 "id": "WPSEC-2026-1301",
 "url": "https://wpsec.com/vuln/WPSEC-2026-1301/",
 "json_url": "https://wpsec.com/vuln/WPSEC-2026-1301/advisory.json",
 "markdown_url": "https://wpsec.com/vuln/WPSEC-2026-1301/index.md",
 "title": "Meta Box - WordPress Custom Fields Framework <= 5.15.2 - Authenticated (Contributor+) Stored Cross-Site Scripting via Block Editor Field",
 "description": "The Meta Box plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the block_editor field type in all versions up to, and including, 5.15.2 due to the field value being saved without any sanitization, even for users lacking the unfiltered_html capability. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts into a block_editor custom field that execute whenever a user accesses a page where the field is rendered. Exploitation requires a block_editor field to be registered on content the attacker can edit.",
 "plugin": {
  "slug": "meta-box",
  "name": "Meta Box - WordPress Custom Fields Framework",
  "full_name": "Meta Box – A Framework for Dynamic Websites",
  "wordpress_org": "https://wordpress.org/plugins/meta-box/",
  "advisories_url": "https://wpsec.com/vuln/plugin/meta-box/",
  "attacksurface": "https://attacksurface.wpsec.com/plugin/meta-box"
 },
 "type": "XSS",
 "cwe": [
  "CWE-79"
 ],
 "cve": [],
 "cvss": {
  "version": "3.1",
  "score": 6.4,
  "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N",
  "severity": "Medium"
 },
 "affected": {
  "ranges": [
   {
    "from": "5.11.0",
    "from_inclusive": true,
    "to": "5.15.3",
    "to_inclusive": false
   }
  ],
  "text": [
   "from 5.11.0 before 5.15.3"
  ]
 },
 "introduced_in": "5.11.0",
 "fixed_in": "5.15.3",
 "remediation": "Update to 5.15.3 or later.",
 "fix_released": "2026-10-20T02:20:02+00:00",
 "published": "2026-10-21T10:43:36+00:00",
 "updated": "2026-10-21T10:35:14.131920+00:00",
 "also_published_as": null,
 "references": [
  "https://wpsec.com/vuln/WPSEC-2026-1301/",
  "https://plugins.svn.wordpress.org/meta-box/tags/5.15.3/",
  "https://wordpress.org/plugins/meta-box/"
 ],
 "attacksurface_url": "https://attacksurface.wpsec.com/plugin/meta-box",
 "source": "WPSec",
 "license": {
  "name": "CC BY 4.0",
  "url": "https://creativecommons.org/licenses/by/4.0/"
 },
 "usage": {
  "plugin": "Low",
  "affected_versions": "Low",
  "as_of": "2026-10-21"
 }
}