CVE-2026-3140 Overview
CVE-2026-3140 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Ultimate Dashboard plugin for WordPress in all versions up to and including 3.8.14. The flaw resides in the handle_module_actions function, which contains a defective nonce validation conditional. Unauthenticated attackers can craft a forged request that toggles plugin modules on or off when a site administrator is tricked into clicking a malicious link. The issue is classified under CWE-352: Cross-Site Request Forgery.
Critical Impact
Successful exploitation allows attackers to enable or disable Ultimate Dashboard modules without authorization, altering the administrative interface configuration of affected WordPress sites.
Affected Products
- WordPress Ultimate Dashboard plugin versions up to and including 3.8.14
- WordPress sites where an administrator can be social-engineered into clicking attacker-supplied links
- Sites that have not applied the fix shipped in WordPress Changeset #3479396
Discovery Timeline
- 2026-05-01 - CVE-2026-3140 published to NVD
- 2026-05-01 - Last updated in NVD database
Technical Details for CVE-2026-3140
Vulnerability Analysis
The Ultimate Dashboard plugin exposes administrative actions for toggling internal feature modules. These actions are handled by the handle_module_actions function in class-feature-module.php. The function is intended to verify a WordPress nonce before processing module state changes, but the conditional that gates this verification is implemented incorrectly. As a result, requests reach the module-toggling code path without an enforced nonce check.
An attacker hosts a page or sends a link that issues the module-toggle request to the target site. When an authenticated administrator visits the malicious page, the browser submits the request using the administrator's existing session. The plugin processes the action as if it were a legitimate administrative operation. User interaction is required, which limits unattended exploitation.
Root Cause
The root cause is a flawed conditional surrounding the nonce check inside handle_module_actions. The validation logic permits execution to continue when nonce verification should have aborted the request, breaking the integrity guarantees that WordPress nonces are designed to provide for state-changing operations.
Attack Vector
The attack vector is network-based and requires user interaction from a privileged WordPress administrator. The attacker prepares an HTML page or email containing a forged request targeting the vulnerable endpoint. When the administrator clicks the link or loads attacker-controlled content while authenticated, the request is replayed against the WordPress site under the administrator's credentials. No prior authentication or privileges are required for the attacker.
No verified proof-of-concept code is published. See the Wordfence Vulnerability Analysis for additional technical context.
Detection Methods for CVE-2026-3140
Indicators of Compromise
- Unexpected changes in Ultimate Dashboard module state recorded in the WordPress options table or plugin logs
- HTTP requests to the plugin's module action endpoint originating from external referrers or without a valid _wpnonce parameter
- Administrator browser sessions submitting POST or GET requests to admin endpoints immediately after visiting an external link
Detection Strategies
- Inspect web server access logs for requests targeting Ultimate Dashboard administrative actions with anomalous Referer headers
- Audit WordPress activity logs for module enable or disable events that do not correlate with legitimate administrator workflows
- Compare plugin module configuration against a known-good baseline to identify unauthorized toggling
Monitoring Recommendations
- Enable a WordPress audit logging plugin to capture configuration changes and admin actions with full request metadata
- Forward web server and WordPress logs to a centralized SIEM for correlation of admin sessions with external referrers
- Alert on requests to plugin admin endpoints lacking a verified nonce or originating from cross-origin sources
How to Mitigate CVE-2026-3140
Immediate Actions Required
- Update the Ultimate Dashboard plugin to a version newer than 3.8.14 that includes the fix from Changeset #3479396
- Review current plugin module settings and revert any unauthorized toggle changes
- Instruct administrators to log out of WordPress before browsing untrusted sites or following unsolicited links
Patch Information
The vendor addressed the flawed nonce validation conditional in handle_module_actions via WordPress plugin changeset #3479396. Site operators should upgrade to the patched release published on the WordPress.org plugin repository. Verify the installed version after upgrade through the WordPress plugins administration screen.
Workarounds
- Temporarily deactivate the Ultimate Dashboard plugin until the patched version is installed
- Restrict access to the WordPress admin interface using IP allow-listing at the web server or WAF layer
- Deploy a web application firewall rule that blocks requests to plugin admin endpoints missing a valid _wpnonce parameter
- Require administrators to use isolated browser profiles for WordPress administration to reduce CSRF exposure
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
