EUVD-2026-76834
GHSA-cg5c-mg8j-jqc2
Vulnerability Assessment
| Weakness |
CWE
OWASP Top 10:2025
A08:2025 - Software or Data Integrity Failures
ASVS 5.0
V1 - Encoding and Sanitization Safe deserialization, type allowlists
MITRE ATT&CK
2 techniques across 2 tactics: Execution, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. |
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Alert meAnalysisAIv1 – Sep 12, 2026
Remote code execution is achievable in Tutor LMS WordPress plugin (≤4.0.7) via a PHP Object Injection flaw in the withdrawal account AJAX handler that exploits a subtle interaction between esc_sql() percent-escaping and PHP serialized string-length declarations. Authenticated attackers with subscriber-level access — or unauthenticated attackers on sites with user registration enabled, the typical eLearning configuration — can inject an arbitrary serialized object stream and trigger the well-documented GuzzleHttp\Cookie\FileCookieJar POP chain to write a webshell to an attacker-specified path. No public exploit or KEV listing is confirmed at time of analysis, but a fix changeset is available and the POP chain is reliably reachable due to the plugin's bundled PayPal Composer autoloader.
Affected VersionsENISA
Affected Packages
Source: OSV (Open Source Vulnerabilities)
Affects your stack
Affects 1 package in euvd
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Severity by source
AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Primary rating from Vendor (Wordfence) · only source for this CVE.
CVSS VectorVendor: Wordfence
DescriptionCVE.org
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.
Executive ViewAI
Tutor LMS WordPress plugin (versions ≤4.0.7) contains a remote code execution vulnerability with no vendor-released patch available. The flaw allows new user registrants on typical eLearning installations-or low-privilege subscribers on any site-to execute arbitrary code and compromise the entire WordPress deployment. Organizations should treat this as an urgent security priority given the plugin's popularity in educational settings and the absence of a security update.
Within 24 hours: Disable the Tutor LMS plugin on all WordPress installations running version 4.0.7 or earlier and document which sites rely on it; implement plugin deactivation immediately if the site functionality allows, or restrict user registration to prevent unauthenticated exploitation of the withdrawal account handler. Within 7 days: Audit server logs and WordPress activity logs for exploitation attempts targeting the plugin's withdrawal AJAX endpoint, and monitor affected sites for unauthorized file writes or webshell activity. Within 30 days: Watch the Tutor LMS vendor repository for release of a patched version (4.0.8 or later) and plan for immediate deployment once available; if internal development resources exist, evaluate applying the vendor's publicly available fix changeset to create an interim build as a bridge measure.
Disable user registration on affected WordPress sites to eliminate the unauthenticated attack vector; restrict subscription-level account creation to trusted users only; implement Web Application Firewall (WAF) rules to block requests to the withdrawal account AJAX handler; monitor file system for unauthorized PHP file writes in WordPress upload directories.
Threat Intelligence Overview
NVD
CVE.org
EPSS
How this decision was reached
The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.
What every action level means
SSVC AssessmentENISA
Priority Score
Attack Technique
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