CVE-2026-82845: Unknown Masteriyo Lms

Critical severity, CVSS 9.9. EPSS: 0.6% chance of exploitation in the next 30 days.

The Masteriyo LMS WordPress plugin before 3.4.1 does not prevent user-supplied values held as metadata from being deserialized when they are read back, allowing users with a minimal account to inject arbitrary PHP objects and, by way of a class shipped in a library bundled with the Masteriyo LMS WordPress plugin before 3.4.1, write and execute arbitrary code on the server. A weaker form of the same issue is reachable without an account and yields an arbitrary file write rather than code execution.

Affected products

• Unknown Masteriyo Lms: before 3.4.1 (fixed in 3.4.1)

Published 2026-09-12. Last modified 2026-09-14.