Description
The User Registration & Membership plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the `embed_form_action()` function in all versions up to, and including, 5.1.4. This makes it possible for authenticated attackers, with Contributor-level access and above, to append shortcode content to arbitrary pages they do not own or have permission to edit.
References6
- plugins.trac.wordpress.org/browser/user-registration/tags/5.1.2…
- plugins.trac.wordpress.org/browser/user-registration/tags/5.1.2…
- plugins.trac.wordpress.org/browser/user-registration/trunk/incl…
- plugins.trac.wordpress.org/browser/user-registration/trunk/incl…
- plugins.trac.wordpress.org/changeset/3485702/user-registration/…
- www.wordfence.com/threat-intel/vulnerabilities/id/c8798fb2-4cab…
Metrics
- CVSS 3.1
-
4.3
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N - EPSS — exploit probability
- 0% percentile: 23 · as of 13 November 2026
- CWE
- CWE-862
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.