CVE-2026-82845 Masteriyo LMS < 3.4.1 - Subscriber+ PHP Object Injection
Authenticated users can achieve remote code execution via PHP object injection in the Masteriyo LMS WordPress plugin.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-82845?
CVE-2026-82845 is a critical unsafe deserialization vulnerability in Unknown Masteriyo LMS, published on 12 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-502
Which versions are affected by CVE-2026-82845?
How do I fix CVE-2026-82845?
No fix has been published for CVE-2026-82845 yet. Limit exposure of the affected software until one is available.
Upgrade, and only deserialise data from trusted sources or with an allow-list of types. More about Unsafe deserialization.
Is CVE-2026-82845 being exploited?
There is no known exploitation of CVE-2026-82845 in the wild and no public exploit code.
Sources
Also known as GHSA-mv63-gmf8-5x76.