WordPress security changelog
HIGH CVE-2026-104723 Deferred

LifterLMS – WP LMS for eLearning, Online Courses, & Quizzes: Code execution

A user with edit_course, such as an Instructor, Assistant or LMS Manager, can feed attacker-controlled temporary lesson metadata into PHP deserialization. No usable gadget chain is identified in LifterLMS; file access or code execution requires a compatible gadget chain in another installed component and is not a standalone demonstrated effect. Affected versions: <= 10.2.1.

CVE / CNA score 8.8 CVSS 3.1 · security@wordfence.com
NVD score Pending NVD has not published its own CVSS assessment.
Component
LifterLMS – WP LMS for eLearning, Online Courses, & Quizzes
Plugin slug
lifterlms
Affected
<= 10.2.1
Safe version
10.3.0
Published
Oct 10, 2026
Weakness
CWE-502 — Deserialization of Untrusted Data

This CVE was published Oct 10, 2026 and is one of 20 known issues for this plugin.

What to do

Update, patch or deactivate.

The official author release notes confirm remediation by 10.3.0; this does not establish that every intervening release was affected. Update the affected edition to 10.3.0 or a later maintained release on its supported branch. Disable the affected feature or deactivate the component until the update is installed. Application-level remediation: Replace deserialization of attacker-controlled PHP objects with a strictly validated data-only format; never instantiate caller-selected classes. Official author release notes: https://wordpress.org/plugins/lifterlms/.

A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.

Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.

Source record

Technical description

The LifterLMS – WP LMS for eLearning, Online Courses, & Quizzes plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 10.2.1 via deserialization of untrusted input . This makes it possible for authenticated attackers, with custom-level access and above, to inject a PHP Object. No known POP chain is present in the vulnerable software, which means this vulnerability has no impact unless another plugin or theme containing a POP chain is installed on the site. If a POP chain is present via an additional plugin or theme installed on the target system, it may allow the attacker to perform actions like delete arbitrary files, retrieve sensitive data, or execute code depending on the POP chain present. This vulnerability is only exploitable during lesson creation when a temporary lesson ID triggers the custom metadata path, and requires the attacker to hold a role with the edit_course capability, such as Instructor, Instructor's Assistant, LMS Manager, or Administrator.

CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Primary and upstream sources