ClickCease Click Fraud Protection <= 3.3.0 - Unauthenticated Missing Authorization to Server-Side Protection Bypass via validate_clickcease_response AJAX Action
- ID
- WPSEC-2026-2253
- Plugin
- ClickCease Click Fraud Protection (clickcease-click-fraud-protection)
- Affected
- all versions before 3.3.1
- Remediation
- Update to 3.3.1 or later.
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness
- CWE-862
- Usage
- Plugin Low · Affected versions Low among sites WPSec scans, 2026-11-03
- Attack surface
- ClickCease Click Fraud Protection on WPSec AttackSurface
- Fix released
- Published
Description
The ClickCease Click Fraud Protection plugin for WordPress is vulnerable to unauthorized modification of data via the public validate_clickcease_response AJAX action in all versions up to, and including, 3.3.0. This is due to the RTI_Service::validateRTIClient() function updating the 'cheq_invalid_secret' site option based on the result of decrypting an attacker-supplied 'cheq_hash' value, while the required nonce is exposed to every front-end visitor. This makes it possible for unauthenticated attackers to send a malformed hash that sets the flag and disables the plugin's server-side bot and click-fraud validation site-wide.
References
- https://wpsec.com/vuln/WPSEC-2026-2253/
- https://plugins.svn.wordpress.org/clickcease-click-fraud-protection/tags/3.3.1/
- https://wordpress.org/plugins/clickcease-click-fraud-protection/
Published by WPSec. Provided as is, without warranty. Corrections: contact us.
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