Description
The LearnPress plugin for WordPress is vulnerable to PHP Object Injection in versions up to, and including, 4.4.10 via deserialization of untrusted input from the 'checkout-email' request parameter during the checkout AJAX action. The value is passed through sanitize_text_field(), which does not strip serialized object syntax, then stored in the LearnPress session table and later fed to LP_Helper::maybe_unserialize() → unserialize() (without an allowed_classes restriction) by LP_Session_Handler::get() on subsequent requests. This makes it possible for unauthenticated attackers to inject a PHP Object.
References6
- plugins.trac.wordpress.org/browser/learnpress/tags/4.4.9.1/inc/…
- plugins.trac.wordpress.org/browser/learnpress/tags/4.4.9.1/inc/…
- plugins.trac.wordpress.org/browser/learnpress/tags/4.4.9.1/inc/…
- plugins.trac.wordpress.org/browser/learnpress/tags/4.4.9.1/inc/…
- plugins.trac.wordpress.org/changeset?reponame=&old=3750024%40le…
- www.wordfence.com/threat-intel/vulnerabilities/id/3e28e008-0ec1…
Metrics
- CVSS 3.1
-
9.8
CRITICAL
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - EPSS — exploit probability
- 3% percentile: 85 · as of 10 November 2026
- CWE
- CWE-502
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.