CVE-2026-24939 Overview
CVE-2026-24939 is a Missing Authorization vulnerability affecting the WP Chill Modula Image Gallery plugin (modula-best-grid-gallery) for WordPress. This broken access control flaw allows attackers to exploit incorrectly configured access control security levels, potentially enabling unauthorized access to gallery functionality and data that should be restricted to authenticated users with proper permissions.
Critical Impact
Authenticated attackers with low-level privileges can bypass authorization checks to access restricted gallery functionality and potentially view confidential image metadata or gallery configurations.
Affected Products
- WP Chill Modula Image Gallery plugin (modula-best-grid-gallery) versions up to and including 2.13.6
- WordPress installations running vulnerable versions of the Modula Image Gallery plugin
- Websites utilizing Modula gallery features for restricted or private content
Discovery Timeline
- 2026-02-03 - CVE CVE-2026-24939 published to NVD
- 2026-02-03 - Last updated in NVD database
Technical Details for CVE-2026-24939
Vulnerability Analysis
This vulnerability stems from CWE-862 (Missing Authorization), which occurs when the software does not perform authorization checks on functionality that requires it. In the case of the Modula Image Gallery plugin, certain AJAX endpoints or administrative functions fail to verify that the requesting user has the appropriate capabilities before processing the request.
WordPress plugins typically implement authorization through capability checks using functions like current_user_can(). When these checks are missing or improperly implemented, lower-privileged users (such as Subscribers or Contributors) can access functionality intended only for Administrators or Editors.
The network-based attack vector with low complexity means that any authenticated user on the WordPress site can potentially exploit this vulnerability remotely without requiring additional conditions or user interaction.
Root Cause
The root cause is the absence of proper capability verification in one or more plugin functions. The Modula Image Gallery plugin fails to validate user permissions before executing certain operations, allowing authenticated users with minimal privileges to access restricted functionality. This type of broken access control is common in WordPress plugins where developers may overlook authorization checks on AJAX handlers or REST API endpoints.
Attack Vector
The vulnerability requires network access and low-privilege authentication to the WordPress site. An attacker would need to:
- Obtain or register a low-privileged account (e.g., Subscriber role) on the target WordPress site
- Identify the vulnerable endpoint or functionality within the Modula Image Gallery plugin
- Craft requests that bypass the missing authorization check
- Access gallery data, configurations, or functionality that should be restricted to higher-privileged users
The attack does not require user interaction and can be executed directly once authenticated access is obtained. The vulnerability allows unauthorized read access to information (confidentiality impact) but does not appear to allow data modification or denial of service.
Detection Methods for CVE-2026-24939
Indicators of Compromise
- Unexpected AJAX requests to Modula Image Gallery endpoints from low-privileged user accounts
- Access logs showing Subscriber or Contributor users interacting with gallery administrative functions
- Unusual patterns of gallery data access from users who should not have such permissions
- Repeated requests to plugin-specific endpoints from non-administrative accounts
Detection Strategies
- Review WordPress access logs for requests to /wp-admin/admin-ajax.php with Modula-related action parameters from low-privileged users
- Monitor plugin-specific REST API endpoints for unauthorized access attempts
- Implement WordPress security plugins that log and alert on unusual user capability usage
- Audit user activity logs for Subscriber or Contributor roles accessing gallery management functions
Monitoring Recommendations
- Enable detailed logging for WordPress AJAX requests and REST API calls
- Configure alerts for access patterns that indicate privilege boundary violations
- Regularly review user access logs for the Modula Image Gallery plugin functionality
- Implement intrusion detection rules for WordPress plugin exploitation patterns
How to Mitigate CVE-2026-24939
Immediate Actions Required
- Update the Modula Image Gallery plugin to a version newer than 2.13.6 once a patched version is available
- Review user accounts on the WordPress site and remove unnecessary low-privilege accounts
- Temporarily disable the Modula Image Gallery plugin if sensitive galleries are exposed and no patch is available
- Restrict user registration on the site if not required for business operations
Patch Information
Organizations should monitor the Patchstack Vulnerability Report for updates on patch availability. Update to a version higher than 2.13.6 as soon as WP Chill releases a security fix. Always test updates in a staging environment before deploying to production WordPress sites.
Workarounds
- Limit user registration on the WordPress site to reduce the pool of potential attackers
- Review and restrict user roles, ensuring only necessary users have accounts
- Use a Web Application Firewall (WAF) to filter suspicious requests to plugin endpoints
- Consider implementing additional capability checks via a custom mu-plugin as a temporary measure
- Monitor the site for suspicious activity until an official patch is available
# Check current Modula Image Gallery plugin version
wp plugin list --name=modula-best-grid-gallery --fields=name,version,status
# Update plugin when patch is available
wp plugin update modula-best-grid-gallery
# Alternatively, disable plugin temporarily if sensitive content is at risk
wp plugin deactivate modula-best-grid-gallery
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
