CVE-2025-15100: JAY Login & Register Privilege Escalation

CVE-2025-15100 Overview

The JAY Login & Register plugin for WordPress contains a Privilege Escalation vulnerability in all versions up to and including 2.6.03. This security flaw allows authenticated attackers with Subscriber-level access or higher to elevate their privileges to administrator level by exploiting the jay_panel_ajax_update_profile function, which permits arbitrary user meta updates without proper authorization checks.

Critical Impact

Authenticated attackers with minimal privileges (Subscriber-level) can escalate to administrator access, potentially gaining full control over WordPress sites using vulnerable versions of this plugin.

Affected Products

• JAY Login & Register plugin for WordPress versions up to and including 2.6.03

Discovery Timeline

• 2026-02-08 - CVE CVE-2025-15100 published to NVD
• 2026-02-09 - Last updated in NVD database

Technical Details for CVE-2025-15100

Vulnerability Analysis

This vulnerability is classified as Improper Privilege Management (CWE-269). The core issue stems from the plugin's jay_panel_ajax_update_profile function, which processes user profile update requests without implementing adequate authorization controls. When a user submits a profile update request, the function fails to properly validate which user meta fields the requesting user is permitted to modify.

In WordPress, user capabilities and roles are stored as user meta data. By allowing arbitrary user meta updates, an attacker can modify their own capability assignments to grant themselves administrator privileges. This represents a critical breakdown in the principle of least privilege, as Subscriber-level users should only be able to modify a limited set of their own profile fields.

The attack can be executed over the network and requires no user interaction, making it highly practical for exploitation. Once an attacker achieves administrator privileges, they gain complete control over the WordPress installation, including the ability to install malicious plugins, modify site content, access sensitive data, and potentially pivot to the underlying server.

Root Cause

The root cause is improper access control in the jay_panel_ajax_update_profile AJAX handler function. The vulnerable code, located in the file jay-login-register-ajax-handler-user-panel.php at line 624, does not implement a whitelist of permissible user meta fields or verify that the current user has appropriate capabilities to modify sensitive meta values like wp_capabilities or role assignments. This allows any authenticated user to submit crafted requests that update protected user meta fields.

Attack Vector

The attack is executed over the network through WordPress's AJAX interface. An attacker must first obtain an authenticated session with at least Subscriber-level access to the target WordPress site. The attacker then crafts a malicious AJAX request to the jay_panel_ajax_update_profile endpoint, including parameters that specify modifications to their user capabilities or role.

The vulnerable function processes this request and updates the attacker's user meta to include administrator capabilities, effectively escalating their privileges. The attack requires low complexity and no special conditions or user interaction, making it straightforward to execute.

For technical details on the vulnerable code path, refer to the WordPress Plugin Code Reference.

Detection Methods for CVE-2025-15100

Indicators of Compromise

• Unexpected modifications to user roles or capabilities, particularly Subscribers being elevated to Administrator
• Unusual AJAX requests to admin-ajax.php with action parameters related to jay_panel_ajax_update_profile
• Newly created administrator accounts or existing low-privilege accounts suddenly having administrator access
• Audit log entries showing user meta modifications for capability-related fields from non-administrator sessions

Detection Strategies

• Monitor WordPress user role changes via security plugins or custom audit logging, alerting on any privilege escalation events
• Implement web application firewall (WAF) rules to detect and block suspicious AJAX requests targeting the vulnerable endpoint
• Review access logs for patterns of authenticated requests to admin-ajax.php with profile update actions from low-privilege user sessions
• Deploy SentinelOne Singularity Platform to monitor for post-exploitation activities such as malicious plugin installation or file modifications

Monitoring Recommendations

• Enable comprehensive WordPress audit logging to track all user meta modifications and role changes
• Configure real-time alerts for any privilege escalation events within your WordPress installation
• Implement network monitoring to detect unusual patterns of AJAX requests from authenticated sessions
• Regularly audit administrator account lists and compare against authorized personnel

How to Mitigate CVE-2025-15100

Immediate Actions Required

• Update the JAY Login & Register plugin to a patched version newer than 2.6.03 immediately
• Audit all WordPress user accounts to identify any unauthorized privilege escalations that may have already occurred
• Temporarily deactivate the JAY Login & Register plugin if an update is not yet available and the plugin is not critical to operations
• Review recent user activity logs for any suspicious profile update requests from low-privilege users

Patch Information

The vulnerability affects JAY Login & Register plugin versions up to and including 2.6.03. Site administrators should update to the latest available version through the WordPress plugin repository. For detailed vulnerability information, consult the Wordfence Vulnerability Report.

Workarounds

• If unable to update immediately, deactivate the JAY Login & Register plugin until a patch can be applied
• Implement a web application firewall rule to block requests to the vulnerable AJAX handler endpoint
• Restrict user registration to prevent attackers from easily obtaining authenticated sessions
• Consider using a WordPress security plugin to add additional access control layers around user meta modifications

# WordPress CLI commands to audit and manage user roles
# List all administrator users to identify unauthorized accounts
wp user list --role=administrator --format=table

# Check recent user meta changes (requires audit logging plugin)
# Review wp_usermeta table for suspicious capability modifications
wp db query "SELECT * FROM wp_usermeta WHERE meta_key='wp_capabilities' ORDER BY umeta_id DESC LIMIT 20"