CSRF in Ksolves Kcaptcha
CVE-2026-4121
The Kcaptcha plugin for WordPress is vulnerable to Cross-Site Request Forgery in all versions up to and including 1.0.1. This is due to missing nonce validation in the plugin's settings page handler (admin/setting.php). The settings form d…
Vulnerability class: CSRF (Cross-Site Request Forgery)
EPSS: 0.000 (0.6th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N.
Affected products
- Ksolves Kcaptcha — versions 0
Weakness classification (CWE)
References
- www.wordfence.com/threat-intel/vulnerabilities/id/a6c1c73b-76e3-4cb9-ad53-9d5d4…
- plugins.trac.wordpress.org/browser/kcaptcha/trunk/admin/setting.php
- plugins.trac.wordpress.org/browser/kcaptcha/tags/1.0.1/admin/setting.php
- plugins.trac.wordpress.org/browser/kcaptcha/trunk/admin/setting.php
- plugins.trac.wordpress.org/browser/kcaptcha/tags/1.0.1/admin/setting.php
- plugins.trac.wordpress.org/browser/kcaptcha/trunk/admin/setting.php
- plugins.trac.wordpress.org/browser/kcaptcha/tags/1.0.1/admin/setting.php
Frequently asked questions
- What is CVE-2026-4121?
- CVE-2026-4121 is a medium-severity vulnerability in Ksolves Kcaptcha, classified under Cross-Site Request Forgery (CSRF). CVSS score: 4.3/10. Published 2026-04-22.
- How severe is CVE-2026-4121?
- Medium severity. CVSS v3 base score is 4.3 out of 10.