TI-2026-83318 Aliases CVE-2026-118090 GHSA-rm8v-6xph-365g

PHP Object Injection in WordPress MasterStudy LMS plugin

MEDIUM 40CWE-502Published 2026-10-30 · Updated 2026-10-30

Key facts

Attack vector: Network
Privileges required: Low
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-502.

Summary

The Stylemix MasterStudy LMS plugin for WordPress through 3.7.55 fails to safely handle untrusted serialized data, which allows PHP object injection (CWE-502). A remote attacker with low privileges and a Subscriber account can exploit this without user interaction, with high impact to confidentiality, integrity and availability.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Description from the CNA

Subscriber PHP Object Injection in MasterStudy LMS <= 3.7.55 versions.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00446 39th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
StylemixThemes	MasterStudy LMS	up to 3.7.55	—	No fix listed	CNA

MasterStudy LMS VendorStylemixThemes Affected up to 3.7.55 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for MasterStudy LMS.

Written with Claude Haiku 5.5 from the sources below · 2026-10-31

Timeline

2026-10-30 Threatist record created from CVE-2026-118090
2026-10-30 CISA SSVC decision points changed
2026-10-30 Priority changed: MEDIUM → LOW
2026-10-30 Alias added: GHSA-rm8v-6xph-365g
2026-11-01 Priority changed: LOW → MEDIUM

References

Other 1

https://patchstack.com/database/wordpress/plugin/masterstudy-lms-learning-management-system/vulnerability/wordpress-masterstudy-lms-plugin-3-7-55-php-object-injection-vulnerability?_s_id=cve

TI-2024-01413 MasterStudy LMS WordPress Plugin – for Online Courses and Education <= 3.2.5 - Unauthenticated SQL Injection CVSS 3.1CRITICAL 9.8
TI-2022-00364 MasterStudy LMS < 2.7.6 - Unauthenticated Admin Account Creation CVSS 3.1CRITICAL 9.8
TI-2024-24620 WordPress Consulting Elementor Widgets plugin <= 1.3.0 - Remote Code Execution (RCE) vulnerability CVSS 3.1CRITICAL 9.9
TI-2023-02655 BookIt <= 2.3.7 - Authentication Bypass CVSS 3.1CRITICAL 9.8
TI-2024-05535 MasterStudy LMS < 3.3.24 - Privilege Escalation to Instructor CVSS 3.1CRITICAL 9.1
TI-2024-24618 WordPress Consulting Elementor Widgets plugin <= 1.3.0 - Unauthenticated Local File Inclusion vulnerability CVSS 3.1CRITICAL 9.8

See all 172 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences