Chloe Chamberland

#143of 56,330
1001.9Total CVSS
Vulnerabilities · 129
Medium
49
High
51
Critical
29
PT-2026-90598
8.8
2026-09-12
Themeum · Tutor Lms – Elearning/Online Course Solution · CVE-2026-78175
The Tutor LMS – eLearning and online course solution plugin for WordPress is vulnerable to PHP Object Injection in all versions up to, and including, 4.0.7 via the `withdraw method field` parameter of the `tutor save withdraw account` AJAX handler. This is due to the handler lacking any capability or role check, relying solely on a nonce, while also passing attacker-supplied values through `esc sql()`, which replaces every `%` character with a 66-byte HMAC placeholder token before the data is serialized and stored via `update user meta()`; when the meta is later retrieved, the placeholder is collapsed back to a single `%`, leaving serialized string length declarations 65 bytes greater than the actual content, and because array keys originate from entirely unescaped POST field names, `unserialize()` over-reads into attacker-controlled bytes, allowing injection of an arbitrary serialized object stream. This makes it possible for authenticated attackers, with subscriber-level access and above, to achieve remote code execution on the server by triggering the `GuzzleHttpCookieFileCookieJar` POP chain, reachable via the `spl autoload register` loader in `TUTORRestAPI` which loads the plugin's own bundled PayPal Composer autoloader, writing attacker-controlled content to an attacker-specified filename. This has an unauthenticated pathway when user registration is enabled, which is common for students and teachers to register, and it requires the monetization feature to be enabled.