CVE-2026-24622: Suggestion Toolkit Auth Bypass Vulnerability

CVE-2026-24622 Overview

CVE-2026-24622 is a Missing Authorization vulnerability discovered in the Suggestion Toolkit WordPress plugin developed by Sergiy Dzysyak. This broken access control vulnerability allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized users to perform actions they should not have access to within WordPress installations running the affected plugin.

The vulnerability stems from CWE-862 (Missing Authorization), indicating that the plugin fails to properly verify whether a user is authorized to perform certain operations before allowing those operations to execute. This type of flaw can lead to unauthorized data access and modification by authenticated users with lower privilege levels.

Critical Impact

Authenticated attackers with minimal privileges can bypass access control mechanisms to read or modify data they should not have access to, potentially compromising site integrity and confidentiality.

Affected Products

• Suggestion Toolkit WordPress Plugin version 5.0 and earlier
• WordPress installations with Suggestion Toolkit plugin enabled
• All prior versions from initial release through version 5.0

Discovery Timeline

• January 23, 2026 - CVE-2026-24622 published to NVD
• January 26, 2026 - Last updated in NVD database

Technical Details for CVE-2026-24622

Vulnerability Analysis

This vulnerability represents a classic broken access control flaw where the Suggestion Toolkit plugin fails to implement proper authorization checks before processing user requests. When a user initiates an action through the plugin, the application does not adequately verify whether the authenticated user possesses the necessary permissions to perform that specific operation.

The network-accessible nature of this vulnerability means it can be exploited remotely by any authenticated user with a WordPress account on the target system. The attack requires no user interaction beyond the initial authentication, making it straightforward to exploit once an attacker has low-level credentials.

The confidentiality and integrity impacts are limited in scope, allowing attackers to potentially read or modify a subset of data within the plugin's functional domain. However, the vulnerability does not appear to impact system availability.

Root Cause

The root cause is CWE-862 (Missing Authorization) - the Suggestion Toolkit plugin does not perform adequate authorization checks before executing privileged operations. This occurs when developers assume that authentication (verifying user identity) is sufficient, without implementing proper authorization (verifying user permissions for specific actions).

In WordPress plugins, this commonly manifests when AJAX handlers or REST API endpoints fail to include capability checks using functions like current_user_can() before processing requests that should be restricted to administrators or editors.

Attack Vector

The attack vector is network-based, requiring an authenticated attacker with low-level privileges (such as a subscriber or contributor role) to send crafted requests to the vulnerable plugin endpoints. The attacker can bypass the intended access control restrictions by directly invoking plugin functionality that lacks proper permission verification.

An attacker would typically:

1. Authenticate to the WordPress site with any valid user account
2. Identify the vulnerable plugin endpoints through reconnaissance
3. Craft HTTP requests to those endpoints to perform unauthorized actions
4. Access or modify suggestion data that should be restricted to higher-privileged users

For technical details on the exploitation mechanism, refer to the Patchstack WordPress Vulnerability Database.

Detection Methods for CVE-2026-24622

Indicators of Compromise

• Unusual activity from low-privileged user accounts accessing plugin administrative functions
• HTTP requests to Suggestion Toolkit AJAX endpoints from non-administrative users
• Unexpected modifications to suggestion data by users who should not have edit permissions
• WordPress audit logs showing plugin actions performed by subscriber or contributor accounts

Detection Strategies

• Implement WordPress audit logging to track all plugin-related actions and correlate with user privilege levels
• Monitor HTTP traffic for POST requests to Suggestion Toolkit endpoints originating from non-admin sessions
• Review access logs for patterns indicating enumeration or testing of plugin functionality
• Deploy Web Application Firewall (WAF) rules to detect anomalous plugin endpoint access patterns

Monitoring Recommendations

• Enable comprehensive WordPress activity logging using security plugins such as WP Activity Log
• Configure alerts for any Suggestion Toolkit operations performed by users without administrative capabilities
• Establish baseline behavior patterns for legitimate plugin usage to identify anomalies
• Regularly audit user roles and permissions to ensure principle of least privilege

How to Mitigate CVE-2026-24622

Immediate Actions Required

• Audit current installations to identify if Suggestion Toolkit version 5.0 or earlier is deployed
• Review recent plugin activity logs for signs of unauthorized access or data manipulation
• Consider temporarily disabling the Suggestion Toolkit plugin until a patched version is available
• Restrict WordPress user registrations and audit existing low-privilege accounts

Patch Information

At the time of publication, no official patch has been confirmed. Site administrators should monitor the official WordPress plugin repository and the Patchstack vulnerability database for updates from the plugin developer. When a patched version becomes available, update immediately through the WordPress dashboard.

Workarounds

• Disable the Suggestion Toolkit plugin if it is not critical to site functionality
• Implement additional access control at the web server level to restrict plugin endpoint access
• Use a Web Application Firewall to filter requests to vulnerable plugin endpoints
• Remove or demote unnecessary user accounts to reduce the attack surface

# WordPress CLI commands to audit and manage the plugin
# List all active plugins and versions
wp plugin list --status=active --format=table

# Deactivate Suggestion Toolkit temporarily
wp plugin deactivate suggestion-toolkit

# Audit users with subscriber role who could exploit the vulnerability
wp user list --role=subscriber --format=table