CVE-2026-19840 Overview
CVE-2026-19840 affects the Notiqoo WordPress plugin in versions prior to 1.4.14. The plugin exposes several AJAX actions without capability checks and constructs the target option name from user-supplied input. Any authenticated user with a role as low as contributor can modify arbitrary WordPress options. Attackers can abuse this behavior to deactivate the Notiqoo plugin and lock every administrator out of the site.
Critical Impact
A contributor-level account can overwrite arbitrary WordPress options, deactivate security plugins, and revoke administrator access site-wide.
Affected Products
- Notiqoo WordPress plugin versions before 1.4.14
- WordPress sites permitting contributor or higher role registrations
- Any environment where the vulnerable plugin remains active
Discovery Timeline
- 2026-09-10 - CVE-2026-19840 published to NVD
- 2026-09-10 - Last updated in NVD database
Technical Details for CVE-2026-19840
Vulnerability Analysis
The Notiqoo plugin registers multiple AJAX endpoints that do not enforce a current_user_can() capability check. Any authenticated session, including a contributor account, can invoke these actions. The handler builds the WordPress option name dynamically from parameters supplied in the AJAX request. The option value is then written through update_option() without validating the target key against an allowlist. This combination of broken access control and unsanitized identifier construction lets a low-privileged user overwrite any option stored in the wp_options table.
Root Cause
The root cause is Broken Access Control [CWE-862] combined with Improper Input Validation [CWE-20]. The plugin trusts the authenticated session for authorization decisions and treats user input as a safe option key. There is no enforcement that the caller holds manage_options or that the target option belongs to Notiqoo.
Attack Vector
An attacker first obtains contributor-level access, either through open registration or a compromised low-privilege account. The attacker then issues a crafted AJAX request to the vulnerable Notiqoo action, specifying an arbitrary option name and value. Overwriting active_plugins deactivates the plugin itself or any other security plugin. Overwriting wp_user_roles strips capabilities from the administrator role and effectively locks out all administrators. See the WPScan Vulnerability Report for additional technical detail.
Detection Methods for CVE-2026-19840
Indicators of Compromise
- Unexpected changes to the active_plugins, wp_user_roles, siteurl, or home option values in wp_options.
- POST requests to /wp-admin/admin-ajax.php referencing Notiqoo actions from contributor or author accounts.
- Sudden administrator lockouts or plugin deactivations without a corresponding admin login.
Detection Strategies
- Audit wp_options for modifications originating outside of administrator sessions and correlate with web access logs.
- Alert on admin-ajax.php calls that reference Notiqoo action names when the authenticated user role is below administrator.
- Enable WordPress core and plugin activity logging to capture option updates with the acting user identity.
Monitoring Recommendations
- Forward WordPress and web server logs into a centralized analytics platform for correlation across sessions and options changes.
- Monitor for role table mutations and treat any write to wp_user_roles as high-severity.
- Track plugin activation and deactivation events and alert on unauthorized state changes.
How to Mitigate CVE-2026-19840
Immediate Actions Required
- Upgrade the Notiqoo plugin to version 1.4.14 or later on every affected WordPress site.
- Review contributor, author, and editor accounts for unexpected additions and disable inactive accounts.
- Inspect the wp_options and wp_user_roles tables for tampering and restore from a known-good backup if changes are found.
Patch Information
The vendor addressed the issue in Notiqoo 1.4.14 by adding capability checks to the affected AJAX actions and constraining the option names the handlers can write. Consult the WPScan Vulnerability Report for advisory details.
Workarounds
- Deactivate and remove the Notiqoo plugin until the patched version is deployed.
- Restrict user registration and remove contributor-level access for untrusted users.
- Place a web application firewall rule in front of admin-ajax.php that blocks Notiqoo actions for non-administrator sessions.
# Example: use WP-CLI to update the plugin to the fixed release
wp plugin update notiqoo --version=1.4.14
wp plugin list --name=notiqoo --fields=name,status,version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
