Deserialization in Masteriyo Lms
CVE-2026-82845
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.
Vulnerability class: Insecure Deserialization
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Unknown Masteriyo Lms
Weakness classification (CWE)
References
- contact@wpscan.com (technical-description, exploit, vdb-entry)
Frequently asked questions
- What is CVE-2026-82845?
- CVE-2026-82845 is a critical-severity vulnerability in Masteriyo Lms, classified under Deserialization of Untrusted Data. CVSS score: 9.9/10. Published 2026-09-12.
- How severe is CVE-2026-82845?
- Critical severity. CVSS v3 base score is 9.9 out of 10.