# CVE-2026-62107: Masteriyo LMS PHP object injection vulnerability

Source: https://junglewise.ai/threats/cve-2026-62107-masteriyo-lms-php-object-injection-vulnerability  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-11. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-62107 · Severity: high · CVSS 8.8 · Published 2026-09-11

Masteriyo LMS is a learning management system plugin for WordPress used to create and deliver online courses. An unauthenticated attacker can inject arbitrary PHP objects into the system, allowing them to execute malicious code on the server and compromise the website, including stealing data, installing backdoors, or taking over the entire site.

Technologies: [ThemeGrill Masteriyo - LMS](https://junglewise.ai/threats/technologies/masteriyo-lms). Vendors: [ThemeGrill](https://junglewise.ai/threats/vendors/themegrill).

## Quick answers

**Is CVE-2026-62107 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-62107 being exploited in the wild.

**How severe is CVE-2026-62107?** High severity, with a CVSS score of 8.8, published 11 September 2026.

**Which products and versions are affected?** ThemeGrill Masteriyo - LMS ≤ 3.4.0.

**Is there a fix for CVE-2026-62107?** A patch was published on 2026-09-11: Version 3.4.1 released with fix Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-62107 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-62107?** Check whether you run ThemeGrill Masteriyo - LMS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is a PHP object injection (deserialization) flaw in Masteriyo LMS versions 3.4.0 and earlier. The vulnerability is unauthenticated and exploitable over the network, requiring no special privileges or user interaction. An attacker can craft malicious serialized PHP objects and inject them into the application, leading to arbitrary code execution on the server. The affected plugin versions are 3.4.0 and earlier; version 3.4.1 and later contain the fix. Exploitation of this vulnerability could enable complete server compromise and is expected to see active exploitation.

## Affected products

- ThemeGrill Masteriyo LMS ≤ 3.4.0

## Timeline

- 2026-09-11: disclosed
- 2026-09-11: patched: Version 3.4.1 released with fix

## References

- [https://wordpress.org/plugins](https://wordpress.org/plugins)
- [https://patchstack.com/database/wordpress/plugin/learning-management-system/vulnerability/wordpress-masteriyo-lms-plugin-3-4-0-php-object-injection-vulnerability?_s_id=cve](https://patchstack.com/database/wordpress/plugin/learning-management-system/vulnerability/wordpress-masteriyo-lms-plugin-3-4-0-php-object-injection-vulnerability?_s_id=cve)

## Related threats

- [Masteriyo LMS arbitrary content deletion](https://junglewise.ai/threats/cve-2026-116410-unauthenticated-arbitrary-content-deletion-in-masteriyo-lms-3-4)
- [Masteriyo LMS broken access control in subscriber pages](https://junglewise.ai/threats/cve-2026-62132-masteriyo-lms-broken-access-control-in-subscriber-pages)
- [ThemeGrill Masteriyo LMS IDOR in versions up to 2.3.1](https://junglewise.ai/threats/cve-2026-65463-themegrill-masteriyo-lms-idor-in-versions-up-to-2-3-1)
- [ThemeGrill Masteriyo LMS broken authentication](https://junglewise.ai/threats/cve-2026-42743-themegrill-masteriyo-lms-broken-authentication)
- [ThemeGrill Masteriyo LMS broken access control payment bypass](https://junglewise.ai/threats/cve-2026-39524-themegrill-masteriyo-lms-broken-access-control-payment-bypass)