EUVD-2026-76787
GHSA-mv63-gmf8-5x76
Severity by source
AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Network-reachable object injection needing only a minimal account (PR:L); bundled gadget chain enables RCE beyond the app scope (S:C) with full C/I/A impact; AC:L per input though gadget-gating arguably raises complexity.
Primary rating from Vendor (wpscan).
CVSS VectorVendor: wpscan
Lifecycle Timeline
5DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Remote code execution in the Masteriyo LMS WordPress plugin before 3.4.1 allows an attacker holding a minimal account (e.g. subscriber/student) to inject arbitrary PHP objects via user-supplied metadata that is unserialized on read-back, and to leverage a gadget class in a bundled library to write and execute arbitrary code on the server (CWE-502). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | The full RCE path requires a minimal authenticated account (PR:L) on a WordPress site running Masteriyo LMS before 3.4.1 - typically any student/subscriber-level user, which is trivial to obtain where course self-enrollment or WordPress registration is open. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | CVSS 3.1 is 9.9 (AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H), reflecting network-reachable RCE requiring only low privileges. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to Masteriyo LMS 3.4.1 or later, which addresses the unsafe deserialization of metadata. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all WordPress installations running Masteriyo LMS and identify those below version 3.4.1; review access logs and user activity for suspicious behavior from student/subscriber accounts. …
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External POC / Exploit Code
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