CVE-2026-12690 Overview
CVE-2026-12690 is a missing authorization vulnerability in the ProfileGrid WordPress plugin before version 5.9.9.7. The plugin fails to perform a capability check on its license management actions. It relies only on a nonce that is exposed to any logged-in user. Authenticated users with Subscriber-level access or higher can overwrite the site's premium license settings. The flaw is classified under [CWE-862] Missing Authorization. The vulnerability requires authenticated access but no user interaction, and it is exploitable over the network.
Critical Impact
Authenticated Subscriber-level attackers can overwrite ProfileGrid premium license settings, disrupting plugin licensing state and potentially disabling premium functionality on affected WordPress sites.
Affected Products
- ProfileGrid WordPress plugin versions prior to 5.9.9.7
- WordPress sites permitting Subscriber-level registration with ProfileGrid installed
- Sites relying on ProfileGrid premium license activation
Discovery Timeline
- 2026-07-24 - CVE-2026-12690 published to NVD
- 2026-07-24 - Last updated in NVD database
Technical Details for CVE-2026-12690
Vulnerability Analysis
The ProfileGrid plugin exposes license management actions to authenticated WordPress users without validating their capabilities. WordPress plugins typically protect privileged actions using two mechanisms: nonces to prevent Cross-Site Request Forgery (CSRF), and capability checks via current_user_can() to enforce authorization. ProfileGrid implements only the nonce check.
Because the nonce is generated and rendered for any authenticated session, low-privilege users such as Subscribers can retrieve it. They can then submit valid license management requests. The plugin processes these requests as if they came from an administrator, allowing overwrite of premium license settings.
The scope of impact is limited to license configuration state, resulting in confidentiality and integrity impact on plugin settings but no direct availability loss.
Root Cause
The root cause is a missing capability check on the plugin's license management handler. The developer treated the nonce as an authorization primitive, but nonces are anti-CSRF tokens rather than authorization controls. Any logged-in user who can access a page rendering the nonce can reuse it against the vulnerable action.
Attack Vector
An attacker must first obtain a Subscriber-level account, which is trivial on WordPress sites that allow open registration. The attacker retrieves the license management nonce from an authenticated page. The attacker then issues an HTTP POST request to the ProfileGrid license management endpoint, supplying attacker-controlled license values. The plugin accepts the request and overwrites the site's premium license settings.
Exploitation code is not required beyond a standard authenticated HTTP request. See the WPScan Vulnerability Details for further technical context.
Detection Methods for CVE-2026-12690
Indicators of Compromise
- Unexpected changes to ProfileGrid premium license configuration stored in the WordPress wp_options table
- POST requests to ProfileGrid admin-ajax.php license management actions originating from non-administrator user IDs
- Newly registered Subscriber accounts followed by requests to plugin admin AJAX endpoints
Detection Strategies
- Review WordPress access logs for authenticated requests to ProfileGrid AJAX actions submitted by users lacking the manage_options capability
- Compare current ProfileGrid license option values against a known-good baseline to detect unauthorized modification
- Audit the ProfileGrid plugin version deployed across all WordPress sites and flag any instance below 5.9.9.7
Monitoring Recommendations
- Enable WordPress audit logging to record option changes and AJAX invocations by user role
- Alert on any modification of ProfileGrid license options performed by non-administrator sessions
- Monitor new user registrations correlated with immediate access to plugin admin endpoints
How to Mitigate CVE-2026-12690
Immediate Actions Required
- Upgrade the ProfileGrid plugin to version 5.9.9.7 or later on every WordPress installation
- Review current ProfileGrid license settings and restore correct values if tampering is suspected
- Disable open user registration where it is not required for site functionality
Patch Information
The vendor addressed CVE-2026-12690 in ProfileGrid version 5.9.9.7 by adding a capability check to the license management handler. Administrators should update through the WordPress plugin manager or by replacing plugin files with the patched release. Refer to the WPScan Vulnerability Details for advisory information.
Workarounds
- Temporarily deactivate the ProfileGrid plugin until the patched version is deployed
- Restrict WordPress registration to Administrator approval to prevent untrusted Subscriber accounts
- Apply Web Application Firewall (WAF) rules blocking non-administrator access to ProfileGrid license management AJAX actions
# Update ProfileGrid using WP-CLI
wp plugin update profilegrid-user-profiles-groups-and-communities --version=5.9.9.7
# Verify installed version
wp plugin get profilegrid-user-profiles-groups-and-communities --field=version
# Disable open registration as a hardening step
wp option update users_can_register 0
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
