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CVE-2026-78175— Tutor LMS <= 4.0.7 - Authenticated (Subscriber+) PHP Object Injection to Remote Code Execution

Quick assessment

Affected
themeum Tutor LMS – eLearning and online course solution
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WordPress Tutor LMS是WordPress基金会开源的一款在线学习管理系统。 WordPress Tutor LMS 4.0.7及之前版本存在反序列化注入漏洞，该漏洞源于tutor_save_withdraw_account AJAX处理程序中的withdraw_method_field参数缺乏权限或角色检查，仅依赖nonce，且esc_sql()替换%字符后序列化存储与取回时长度声明不一致，导致unserialize()过度读取攻击者可控字节并注入任意序列化对象流，可能使订阅者及以上权限

CVSS 8.8 · High EPSS 1.07% · P65

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
themeum Tutor LMS – eLearning and online course solution ≤ 4.0.7 affected
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I. Basic Information for CVE-2026-78175

Vulnerability Information
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Vulnerability Title
Tutor LMS <= 4.0.7 - Authenticated (Subscriber+) PHP Object Injection to Remote Code Execution
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可信数据的反序列化
Source: CVE Program / CVE List V5
Vulnerability Title
WordPress Tutor LMS 反序列化注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WordPress Tutor LMS是WordPress基金会开源的一款在线学习管理系统。 WordPress Tutor LMS 4.0.7及之前版本存在反序列化注入漏洞，该漏洞源于tutor_save_withdraw_account AJAX处理程序中的withdraw_method_field参数缺乏权限或角色检查，仅依赖nonce，且esc_sql()替换%字符后序列化存储与取回时长度声明不一致，导致unserialize()过度读取攻击者可控字节并注入任意序列化对象流，可能使订阅者及以上权限
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
themeum Tutor LMS – eLearning and online course solution 0 ~ 4.0.7 -

II. Public POCs for CVE-2026-78175

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III. Intelligence Information for CVE-2026-78175

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Patches & Fixes for CVE-2026-78175 (5)

Vendor Advisories for CVE-2026-78175 (1)

Vendor Pages for CVE-2026-78175 (1)

IV. Related Vulnerabilities

Same product: Tutor LMS – eLearning and online course solution
Same vendor: themeum
Same weakness: CWE-502