CVE-2026-82845
Critical
Description
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.
SeverityCritical
CVSS9.9
Exploit probability—
ProductMasteriyo LMS
PublishedSep 12, 2026
First seenSep 12, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Update
- Masteriyo LMS3.4.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Masteriyo LMS | v < 3.4.1 | 3.4.1 |
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