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Vulnerability record · CVE-2026-82845 · published 12 September 2026

CVE-2026-82845: Deserialization of untrusted data vulnerability

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.

9.9 CVSS 3.1 Critical EPSS 0.64% · top 51.5% CWE-502 · Deserialization of untrusted data Deferred
9.9CVSS 3.1 base score
0.64%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
14 Sep 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References

LinkTags
https://wpscan.com/vulnerability/5ced30ea-8b78-495f-b10c-42b3f10adcb3/

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Source: NIST National Vulnerability Database (record CVE-2026-82845), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.