# CVE-2026-104723: LifterLMS plugin PHP Object Injection vulnerability

Source: https://junglewise.ai/threats/cve-2026-104723-the-lifterlms-wp-lms-for-elearning-online-courses-quizzes-plugin  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-10. Updated: 2026-10-16  
License: CC BY 4.0 with a link back

CVE-2026-104723 · Severity: high · CVSS 8.8 · Published 2026-10-10

The LifterLMS WordPress plugin, used to create and manage online courses and learning content, contains a PHP Object Injection flaw that allows authenticated course instructors and administrators to inject malicious code. While the plugin itself does not provide a direct attack path, the vulnerability becomes dangerous when combined with vulnerable third-party plugins or themes installed on the same WordPress site, potentially enabling attackers to delete files, steal data, or execute arbitrary code. Exploitation requires the attacker to hold instructor-level or higher permissions and occurs during lesson creation.

Vendors: [LifterLMS](https://junglewise.ai/threats/vendors/lifterlms).

## Quick answers

**Is CVE-2026-104723 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-104723 being exploited in the wild.

**How severe is CVE-2026-104723?** High severity, with a CVSS score of 8.8, published 10 October 2026.

**Which products and versions are affected?** LifterLMS – WP LMS for eLearning, Online Courses, & Quizzes up to and including 10.2.1.

**Is there a fix for CVE-2026-104723?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-104723 attacked?** It is attacked over the network, in a web application.

**Am I affected by CVE-2026-104723?** Check whether you run LifterLMS – WP LMS for eLearning, Online Courses or & Quizzes at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

PHP Object Injection via unsafe deserialization of untrusted input in the LifterLMS plugin affecting all versions up to 10.2.1. The vulnerability is triggered during lesson creation when a temporary lesson ID is used, accessible to authenticated users with edit_course capability (Instructor, Instructor's Assistant, LMS Manager, Administrator). Exploitation depends on the presence of a POP (Property-Oriented Programming) chain in another installed plugin or theme; without such a chain, the vulnerability has no practical impact but may enable arbitrary file deletion, data exfiltration, or remote code execution.

## Affected products

- LifterLMS LifterLMS – WP LMS for eLearning, Online Courses, & Quizzes up to and including 10.2.1

## Timeline

- 2026-10-10: disclosed

## References

- [https://plugins.trac.wordpress.org/browser/lifterlms/tags/10.2.1/includes/admin/class.llms.admin.builder.php](https://plugins.trac.wordpress.org/browser/lifterlms/tags/10.2.1/includes/admin/class.llms.admin.builder.php)
- [https://plugins.trac.wordpress.org/browser/lifterlms/tags/10.2.1/includes/admin/class.llms.admin.builder.php](https://plugins.trac.wordpress.org/browser/lifterlms/tags/10.2.1/includes/admin/class.llms.admin.builder.php)