Acadlix LMS <= 1.1.9 - Unauthenticated Arbitrary File Deletion via 'delete_file_data.file_path' Parameter
Strategic Overview
- Status
- Patched in 1.2.0
- Affected Version
<= 1.1.9- CVSS
- 9.1Critical
- Weakness type
- CWE-22 · Improper Limitation of a Pathname to a Restricted Directory
- CVE
CVE-2026-103882
At a glance
CVE-2026-103882 is a critical-severity Improper Limitation of a Pathname to a Restricted Directory vulnerability in the Acadlix LMS WordPress plugin, affecting versions <= 1.1.9. It carries a CVSS score of 9.1 (reachable over the network; low attack complexity; high integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 1.2.0; sites on affected versions should update now. Disclosed October 2026, reported by antaloaalonso.
Vulnerability Overview
The Acadlix LMS – AI Quiz Maker, Online Exam & Course Plugin for WordPress plugin for WordPress is vulnerable to arbitrary file deletion due to insufficient file path validation in the post_delete_assessment_file_by_id function in all versions up to, and including, 1.1.9. This makes it possible for authenticated attackers, with subscriber-level access and above, to delete arbitrary files on the server, which can easily lead to remote code execution when the right file is deleted (such as wp-config.php). The route's permission callback only verifies a generic wp_rest nonce that the plugin itself emits inside the public acadlixOptions JavaScript object on every frontend page, effectively reducing the authentication requirement to unauthenticated.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on integrity, availability.
CWE-22: Improper Limitation of a Pathname to a Restricted Directory
Reaching this weakness in Acadlix LMS <= 1.1.9 takes no account at all. Path traversal happens when user-controlled text is used to build a filesystem path without being constrained to an intended directory, so sequences like ../ walk the resolved path somewhere else.
Depending on the operation, it means reading files outside the intended folder — wp-config.php being the usual target — or writing to and deleting paths the web server can touch. For Acadlix LMS the fix is 1.2.0: builds <= 1.1.9 are affected, anything from 1.2.0 onward is not.
Remediation
Update to version 1.2.0, or a newer patched version
How does WordSec protect against this?
Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Acadlix LMS 1.2.0 closes this, and updating the plugin is the step that ends it.
- Firewall
- Login Security
- Alerts
External References
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