CVE-2026-1075: ZT Captcha <= 1.0.4 - Cross-Site Request Forgery to Settings Update

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-01-24 · updated 2026-06-17
Weakness: CWE-352

Description

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.

Affected products

teamzt ZT Captcha: through 1.0.4

References

https://plugins.trac.wordpress.org/browser/zt-captcha/tags/1.0.4/request/CaptchaRequest.php#L37
https://plugins.trac.wordpress.org/browser/zt-captcha/trunk/request/CaptchaRequest.php#L37
https://www.wordfence.com/threat-intel/vulnerabilities/id/9f9d6da5-1598-4df4-8efc-306370446443?source=cve

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