CVE-2026-82845: CWE-502 Deserialization of Untrusted Data in Masteriyo LMS
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.
AI Analysis
Technical Summary
The Masteriyo LMS WordPress plugin prior to version 3.4.1 improperly deserializes user-supplied metadata values when read back. This flaw enables users with minimal privileges to inject arbitrary PHP objects, leveraging a class included in the plugin's bundled library to execute arbitrary code on the server. A less severe variant of this vulnerability is accessible without authentication and permits arbitrary file writes instead of code execution.
Potential Impact
Successful exploitation allows attackers with minimal user accounts to execute arbitrary PHP code on the server, potentially leading to full system compromise. Without authentication, attackers can write arbitrary files, which may facilitate further attacks or disruption.
Mitigation Recommendations
Upgrade the Masteriyo LMS WordPress plugin to version 3.4.1 or later, where this vulnerability is fixed. No other mitigation details are provided. Patch status is confirmed by the version boundary in the affectedVersions field.
CVE-2026-82845: CWE-502 Deserialization of Untrusted Data in Masteriyo LMS
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 v3.1
Score 9.9critical
Affected software
Masteriyo LMS
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Masteriyo LMS WordPress plugin prior to version 3.4.1 improperly deserializes user-supplied metadata values when read back. This flaw enables users with minimal privileges to inject arbitrary PHP objects, leveraging a class included in the plugin's bundled library to execute arbitrary code on the server. A less severe variant of this vulnerability is accessible without authentication and permits arbitrary file writes instead of code execution.
Potential Impact
Successful exploitation allows attackers with minimal user accounts to execute arbitrary PHP code on the server, potentially leading to full system compromise. Without authentication, attackers can write arbitrary files, which may facilitate further attacks or disruption.
Mitigation Recommendations
Upgrade the Masteriyo LMS WordPress plugin to version 3.4.1 or later, where this vulnerability is fixed. No other mitigation details are provided. Patch status is confirmed by the version boundary in the affectedVersions field.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-08-31T08:27:16.968Z
- State
- PUBLISHED
Threat ID: 6aa4ee6155bf5e2cf5f21fe7
Added to database: 09/12/2026, 06:17:05 UTC
Last enriched: 09/12/2026, 06:47:52 UTC
Last updated: 09/13/2026, 01:34:49 UTC
Views: 15
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