# MDTF – Meta Data and Taxonomies Filter <= 1.3.9 - Authenticated (Contributor+) Missing Authorization to Filter Meta Key Rename

- **ID:** WPSEC-2026-0968
- **Plugin:** MDTF – Meta Data and Taxonomies Filter (`wp-meta-data-filter-and-taxonomy-filter`), https://wordpress.org/plugins/wp-meta-data-filter-and-taxonomy-filter/
- **Affected versions:** all versions before 1.4.0
- **Fixed in:** 1.4.0 (Update to 1.4.0 or later.)
- **Severity:** Medium 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N)
- **Weakness:** CWE-862
- **Usage among sites WPSec scans:** plugin Low, affected versions Low (as of 2026-10-14)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/wp-meta-data-filter-and-taxonomy-filter
- **Fix released:** 2026-10-13
- **Published:** 2026-10-14
- **URL:** https://wpsec.com/vuln/WPSEC-2026-0968/

## Description

The MDTF – Meta Data and Taxonomies Filter plugin for WordPress is vulnerable to unauthorized modification of data via the 'mdf_change_meta_key' AJAX action in all versions up to, and including, 1.3.9, due to a missing capability check on the change_meta_key function, which is protected only by a nonce printed on the filter section edit screen. This makes it possible for authenticated attackers, with Contributor-level access and above, to rewrite the filter items of any filter section and rename a filter meta key in the data of every post on the site.

## References

- https://wpsec.com/vuln/WPSEC-2026-0968/
- https://plugins.svn.wordpress.org/wp-meta-data-filter-and-taxonomy-filter/tags/1.4.0/
- https://wordpress.org/plugins/wp-meta-data-filter-and-taxonomy-filter/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-0968/

License: CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). Free to use, share and adapt, also commercially, if you credit WPSec and link to this advisory.