Vulnerability · Published Sep 12, 2026 · Assigned by WPScan

CVE-2026-82845Masteriyo LMS < 3.4.1 - Subscriber+ PHP Object Injection

Critical 9.9

In plain English

A critical-severity unsafe deserialization in Masteriyo LMS from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 51% of all known vulnerabilities).

Severity (CVSS 3.1)9.9Critical

Exploit odds (30 days)0.6%top 49.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
Unknown	Masteriyo LMS	0 – before 3.4.1

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

https://wpscan.com/vulnerability/5ced30ea-8b78-495f-b10c-42b3f10adcb3/ exploit, vdb-entry, technical-description