CVE-2025-3918: Job Listings Plugin Privilege Escalation

CVE-2025-3918 Overview

The Job Listings plugin for WordPress contains a critical Privilege Escalation vulnerability in versions 0.1 to 0.1.1. The vulnerability exists due to improper authorization within the register_action() function, where the plugin's registration handler reads the client-supplied $_POST['user_role'] parameter and passes it directly to wp_insert_user() without restricting it to a safe set of roles. This flaw allows unauthenticated attackers to register new accounts with arbitrary role assignments, including administrator privileges, effectively granting complete control over the WordPress installation.

Critical Impact
Unauthenticated attackers can elevate their privileges to administrator level, potentially leading to complete site takeover, data theft, malware injection, and use of the compromised site for further attacks.

Affected Products

Job Listings plugin for WordPress version 0.1
Job Listings plugin for WordPress version 0.1.1

Discovery Timeline

2025-05-03 - CVE-2025-3918 published to NVD
2025-05-05 - Last updated in NVD database

Technical Details for CVE-2025-3918

Vulnerability Analysis

This vulnerability represents a classic broken access control issue (CWE-285) where user-controlled input directly influences security-critical operations without proper validation. The register_action() function in class-jlt-form-member.php accepts POST data from registration forms and uses the submitted user_role value when creating new user accounts via WordPress's wp_insert_user() function.

WordPress's user role system is designed to limit what actions users can perform. Roles like "subscriber" have minimal capabilities, while "administrator" roles have full control including plugin installation, theme editing, and user management. By failing to validate or restrict the accepted role values, the plugin allows attackers to bypass this entire permission hierarchy.

Root Cause

The root cause is improper authorization validation in the user registration flow. The vulnerable code path directly trusts user-supplied input for the user_role parameter without implementing a whitelist of allowed roles. Secure implementations would either hardcode the role for new registrations (typically "subscriber") or validate the submitted role against an allowed list before processing.

The vulnerability is located in the class-jlt-form-member.php file at line 68, where POST data is processed without sufficient security controls.

Attack Vector

This is a network-based attack that requires no authentication or user interaction. An attacker can craft a malicious HTTP POST request to the WordPress registration endpoint with a manipulated user_role parameter set to "administrator". The plugin will process this request and create a new user account with full administrative privileges.

The attack flow involves:

Identifying a WordPress site running the vulnerable Job Listings plugin
Sending a crafted registration POST request with user_role=administrator
The plugin creates the account with administrator privileges
The attacker logs in with full site control

For technical details on the vulnerable code path, see the WordPress Job Listings source code and the Wordfence vulnerability report.

Detection Methods for CVE-2025-3918

Indicators of Compromise

Unexpected administrator or high-privilege user accounts appearing in WordPress user management
New user registrations with roles other than the default subscriber role
Suspicious POST requests to registration endpoints containing user_role parameter with elevated values
Unexplained changes to site configuration, themes, or plugins following new account creation

Detection Strategies

Monitor WordPress user creation logs for accounts created with administrator or editor roles through the registration process
Implement web application firewall (WAF) rules to detect and block POST requests containing user_role=administrator to registration endpoints
Review Apache/Nginx access logs for registration endpoint requests with suspicious POST parameters
Deploy file integrity monitoring to detect unauthorized modifications following potential exploitation

Monitoring Recommendations

Enable WordPress audit logging to track all user creation events and role assignments
Configure alerts for any new administrator account creation that doesn't follow established administrative procedures
Implement real-time monitoring of critical WordPress files and database tables for unauthorized modifications
Regularly audit the WordPress users table for accounts with unexpected privilege levels

How to Mitigate CVE-2025-3918

Immediate Actions Required

Update the Job Listings plugin to the latest patched version immediately
Audit existing WordPress user accounts for any unauthorized administrator or high-privilege accounts
Remove or deactivate the plugin if a patch is not yet available
Review recent registration activity for signs of exploitation
Reset credentials for all legitimate administrator accounts if compromise is suspected

Patch Information

Check the WordPress Job Listings plugin developers page for the latest security updates and patch information. Always ensure your WordPress plugins are updated to the most recent versions to receive security fixes.

Workarounds

Temporarily disable user registration functionality on the WordPress site until the plugin is patched
Remove or deactivate the Job Listings plugin entirely if registration features are not critical
Implement a WAF rule to block or sanitize the user_role parameter in registration POST requests
Use WordPress security plugins to enforce role restrictions during user registration

bash

# WAF rule example (ModSecurity) to block user_role manipulation
SecRule ARGS:user_role "@contains administrator" "id:1001,phase:2,deny,status:403,msg:'Blocked potential privilege escalation attempt'"