CVE-2026-18046 Overview
CVE-2026-18046 affects the Cookie Consent WordPress plugin in versions prior to 0.0.10. The plugin exposes a REST route that stores the geolocation service license key but fails to enforce its intended administrator-only capability check. The route falls back to an authentication-only gate, so any authenticated user, including a low-privileged subscriber, can overwrite the stored key. Overwriting the key disrupts the plugin's geolocation-based consent banner targeting. The issue is a broken access control flaw classified under CWE-863: Incorrect Authorization.
Critical Impact
Any authenticated WordPress user can overwrite the geolocation service license key, breaking region-specific cookie consent enforcement and creating potential compliance exposure under regulations such as GDPR and CCPA.
Affected Products
- Cookie Consent WordPress plugin versions prior to 0.0.10
- WordPress sites relying on the plugin's geolocation-based consent banner
- Deployments using the geolocation service license key for regional targeting
Discovery Timeline
- 2026-08-12 - CVE-2026-18046 published to the National Vulnerability Database (NVD)
- 2026-08-12 - Last updated in NVD database
Technical Details for CVE-2026-18046
Vulnerability Analysis
The Cookie Consent plugin registers a REST API route to store the license key used by its geolocation service. The intended design restricts write access to administrators through a capability check. In vulnerable releases, the permission callback resolves to an authentication-only condition rather than a capability assertion. Any user with an authenticated session, down to the subscriber role, can therefore invoke the route successfully.
Successful exploitation lets the attacker overwrite the stored license key with arbitrary content. The plugin subsequently attempts to resolve visitor geolocation using an invalid or attacker-controlled key. This breaks the region-conditional display logic of the consent banner. Sites that depend on the banner to meet regional privacy obligations lose that enforcement, though no direct data confidentiality loss occurs.
Root Cause
The root cause is an incorrect authorization check on the REST endpoint that persists the geolocation license key. The permission callback verifies that a request is authenticated but does not assert the manage_options capability or an equivalent administrator-only check, matching the [CWE-863] pattern.
Attack Vector
Exploitation requires network access to the WordPress REST API and an authenticated account of any privilege level. WordPress installations that allow open user registration are directly reachable. The attacker sends a crafted request to the REST route that persists the license key, supplying an arbitrary value. No user interaction is required beyond the authenticated request. Technical details are documented in the WPScan Vulnerability Report.
Detection Methods for CVE-2026-18046
Indicators of Compromise
- Unexpected changes to the plugin's stored geolocation license key value in the wp_options table
- REST API requests to the Cookie Consent license key route originating from non-administrator accounts
- Consent banner behavior inconsistent with the configured regional targeting rules
- Error entries in plugin or geolocation service logs indicating an invalid license key
Detection Strategies
- Review WordPress REST API access logs for POST or PUT requests to Cookie Consent plugin routes from subscriber or contributor accounts
- Audit wp_options records associated with the plugin for unauthorized modifications and correlate against administrator activity
- Compare current license key values against a known-good baseline captured after configuration
Monitoring Recommendations
- Forward WordPress access logs and REST API telemetry to a centralized log platform for retention and query
- Alert on write requests to plugin-owned REST namespaces from low-privileged roles
- Monitor plugin option updates through database audit triggers or file integrity monitoring on plugin storage
How to Mitigate CVE-2026-18046
Immediate Actions Required
- Update the Cookie Consent WordPress plugin to version 0.0.10 or later on all affected sites
- Rotate the geolocation service license key after upgrading to invalidate any attacker-supplied value
- Audit user accounts and disable open registration where it is not required
- Validate that consent banner targeting behaves as configured after remediation
Patch Information
The vendor addresses the vulnerability in Cookie Consent WordPress plugin version 0.0.10. The fix enforces an administrator capability check on the REST route responsible for storing the geolocation service license key. Refer to the WPScan Vulnerability Report for advisory details.
Workarounds
- Restrict access to the WordPress REST API for non-administrator roles using a security plugin or reverse proxy rules
- Temporarily deactivate the Cookie Consent plugin if patching is not immediately feasible and geolocation targeting is critical
- Disable new user self-registration under Settings to limit the pool of authenticated attackers
# Configuration example: update the plugin via WP-CLI
wp plugin update cookie-consent --version=0.0.10
wp plugin list --name=cookie-consent --fields=name,status,version
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
