Unauthenticated code execution via template variable overwrite
Published Aug 28, 2026 · Updated Aug 28, 2026
Remote code execution in Themeum Tutor LMS 4.0.5 and earlier allows remote attackers to invoke zero-argument PHP functions via AJAX. The unauthenticated tutor_course_filter_ajax handler passes attacker-controlled array keys to extract(), overwriting template, method-map, and context variables before a dynamic function call. No account is required, and successful invocation can create a persistent subscriber account or perform another action exposed by a callable zero-argument PHP function.
Summary
What happened
Remote code execution in Themeum Tutor LMS 4.0.5 and earlier allows remote attackers to invoke zero-argument PHP functions via AJAX. The unauthenticated tutor_course_filter_ajax handler passes attacker-controlled array keys to extract(), overwriting template, method-map, and context variables before a dynamic function call. No account is required, and successful invocation can create a persistent subscriber account or perform another action exposed by a callable zero-argument PHP function.
The record
- CVE
- CVE-2026-16759
- Published
- Aug 28, 2026
- Updated
- Aug 28, 2026
- Vendor
- Themeum
- Product
- Tutor LMS
- Classifications
- T1059
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 28, 2026CVE publishedPublication date reported by the CVE source.
- Aug 28, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0 <=4.0.5
What conditions does exploitation require?
What is affected?
Published CVSS scores
No CVSS assessment is available in this record.
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.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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