Tutor LMS <= 4.0.7 - Authenticated (Subscriber+) PHP Object Injection to Remote Code Execution
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 GuzzleHttp\Cookie\FileCookieJar POP chain, reachable via the spl_autoload_register loader in TUTOR\RestAPI 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.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| WordPress plugin | Tutor LMS – eLearning and online course solution | <= 4.0.7 | 4.0.8 |
References
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H- Weakness (CWE)
CWE-502- Platform
- WordPress
- Package
Tutor LMS – eLearning and online course solution- Disclosed
- 11.09.2026
- Updated
- 11.10.2026 10:23
Sources and licenses
Wordfence Intelligence - d0077d56-11e7-4e74-abe0-63e81db67be3 - Wordfence Intelligence
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Copyright 2012-2026 Defiant Inc.
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Vulnerability history: Tutor LMS – eLearning and online course solution
All published vulnerabilities of this package (WordPress plugin), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 92
- First → latest
- 02.2020 10.2026
- Without a fix
- 0
- Exploited in attacks
- 0
Severity breakdown
- Critical 3
- High 19
- Medium 69
- Low 1
Disclosures per year
- 2020: 1
- 2021: 14
- 2022: 2
- 2023: 8
- 2024: 21
- 2025: 4
- 2026: 42
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Tutor LMS <= 4.0.7 - Authenticated (Subscriber+) PHP Object Injection to Remote Code Execution this entry
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