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CVE-2026-109983

MEDIUM 6.4 CVSS 3.1
Published
October 17, 2026
Last modified
October 19, 2026
NVD status
Deferred
Reported by
security@wordfence.com
Weakness
CWE-79
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Description

The YMC Filter plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'post_title' parameter in all versions up to, and including, 3.12.19 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with author-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The autocomplete REST endpoint is registered with a permission callback that unconditionally returns true, meaning any site visitor — including unauthenticated users — can trigger the payload simply by typing in the YMC filter search box, while only Author-level access is required to store it.

Affected WordPress components

A confirmed match is backed by the plugin or theme slug. A possible match is based on the product name only and should be verified.

Affected products and versions

  • wssoffice21 YMC Filter — Up to and including 3.12.19

References

  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/ymc-smart-filter/tags/3.12.19/ymc2/assets/js/frontend/ymc-public.min.js#L10
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/ymc-smart-filter/tags/3.12.19/ymc2/src/api/abstracts/FG_REST_Abstract_Controller.php#L66
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/ymc-smart-filter/tags/3.12.19/ymc2/src/api/controllers/frontend/FG_REST_Frontend_Search_Controller.php#L135
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/ymc-smart-filter/tags/3.12.19/ymc2/src/api/controllers/frontend/FG_REST_Frontend_Search_Controller.php#L148
  • plugins.trac.wordpress.org https://plugins.trac.wordpress.org/browser/ymc-smart-filter/tags/3.12.20/ymc2/src/api/controllers/frontend/FG_REST_Frontend_Search_Controller.php
  • wordpress.org https://wordpress.org/plugins/ymc-smart-filter
  • www.wordfence.com https://www.wordfence.com/threat-intel/vulnerabilities/id/27cfa62d-ba16-4344-be0c-82cac4d21d1c?source=cve
  • nvd.nist.gov Official NVD record