Vulnerabilities / WCK / WPSEC-2026-2388
WCK <= 2.3.9 - Reflected Cross-Site Scripting via Upload Field
Medium 6.1
CWE-79Fixed in 2.4.0
- ID
- WPSEC-2026-2388
- Plugin
- Custom Post Types and Custom Fields creator – WCK (wck-custom-fields-and-custom-post-types-creator)
- Affected
- all versions before 2.4.0
- Remediation
- Update to 2.4.0 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
- Weakness
- CWE-79
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-11-03
- Attack surface
- WCK on WPSec AttackSurface
- Fix released
- Published
Description
The WCK plugin for WordPress is vulnerable to Reflected Cross-Site Scripting via the 'postedvalues' parameter rendered in the upload field in all versions up to, and including, 2.3.9. This is due to insufficient input sanitization and output escaping: the value decoded from the parameter is echoed without escaping into the upload field's hidden input value attribute and its data-attachment_id attribute. This makes it possible for unauthenticated attackers to inject arbitrary web scripts into pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
References
- https://wpsec.com/vuln/WPSEC-2026-2388/
- https://plugins.svn.wordpress.org/wck-custom-fields-and-custom-post-types-creator/tags/2.4.0/
- https://wordpress.org/plugins/wck-custom-fields-and-custom-post-types-creator/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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