Subscriber-level content modification via unchecked REST authorization
Published Jan 6, 2026 · Updated Jan 6, 2026
Missing authorization in MasterStudy LMS 3.7.6 and earlier allows remote authenticated users to modify or delete site content. Multiple REST API handlers process media, post, and course-template operations without checking the WordPress capabilities required for each action. Subscriber access is sufficient to upload or delete arbitrary media, modify or delete posts, and create or manage course templates.
Summary
What happened
Missing authorization in MasterStudy LMS 3.7.6 and earlier allows remote authenticated users to modify or delete site content. Multiple REST API handlers process media, post, and course-template operations without checking the WordPress capabilities required for each action. Subscriber access is sufficient to upload or delete arbitrary media, modify or delete posts, and create or manage course templates.
The record
- CVE
- CVE-2025-13766
- Published
- Jan 6, 2026
- Updated
- Jan 6, 2026
- Vendor
- StylemixThemes
- Product
- MasterStudy LMS
- Classifications
- CWE-862, T1565.001
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jan 6, 2026CVE publishedPublication date reported by the CVE source.
- Jan 6, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=* <=3.7.6
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo