What the vulnerability does
01Description
The ZT Captcha plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to, and including, 1.0.4. This is due to improper nonce validation on the save_ztcpt_captcha_settings action where the nonce check can be bypassed by sending an empty token value. This makes it possible for unauthenticated attackers to modify the plugin's settings via a forged request granted they can trick a site administrator into performing an action such as clicking on a link.
Explanation of Vulnerability in Simple Terms
02Summary
ZT Captcha versions 1.0.4 and earlier contain a cross-site request forgery (CSRF) vulnerability. An attacker can craft a malicious webpage that, when visited by a logged-in site administrator, performs unwanted actions on the site without their knowledge. The vulnerability requires user interaction—the admin must visit the attacker's page—and affects only the integrity of site operations, not data confidentiality.
What an attacker can do
03Attacker Capabilities
Perform unwanted actions on the site by tricking an admin into visiting a malicious webpage.
Potential impact on your site
04Site Impact
An attacker can modify site settings or data if they trick an admin into clicking a malicious link.
Conditions required to exploit
05Prerequisites
Site admin must visit an attacker-controlled webpage while logged into the site.
Key dates
06Disclosure timeline
January 24, 2026
CVE published
April 8, 2026
Record updated
