# Custom Post Types and Custom Fields creator – WCK <= 2.4.0 - Authenticated (Subscriber+) Missing Authorization to Post Meta Update via wck_sync_translation AJAX Action

- **ID:** WPSEC-2026-2996
- **Plugin:** Custom Post Types and Custom Fields creator – WCK (`wck-custom-fields-and-custom-post-types-creator`), https://wordpress.org/plugins/wck-custom-fields-and-custom-post-types-creator/
- **Affected versions:** all versions before 2.4.1
- **Fixed in:** 2.4.1 (Update to 2.4.1 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 2026-11-12)
- **Attack surface analysis:** https://attacksurface.wpsec.com/plugin/wck-custom-fields-and-custom-post-types-creator
- **Fix released:** 2026-11-10
- **Published:** 2026-11-12
- **URL:** https://wpsec.com/vuln/WPSEC-2026-2996/

## Description

The WCK plugin for WordPress is vulnerable to unauthorized modification of data via the wck_sync_translation AJAX action in all versions up to, and including, 2.4.0, due to a missing capability check and missing nonce verification in the wck_sync_translation_ajax function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to rebuild and overwrite serialized WCK post meta on arbitrary posts that have legacy 'wckwpml_' translation custom fields.

## References

- https://wpsec.com/vuln/WPSEC-2026-2996/
- https://plugins.svn.wordpress.org/wck-custom-fields-and-custom-post-types-creator/tags/2.4.1/
- https://wordpress.org/plugins/wck-custom-fields-and-custom-post-types-creator/

Source: WPSec, https://wpsec.com/vuln/WPSEC-2026-2996/

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.