Kcaptcha <= 1.0.1 - Cross-Site Request Forgery to Settings Update

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4.3
Cross-Site Request Forgery (CSRF)
CVE CVE-2026-4121
CVSS 4.3 (Medium)
Publicly Published April 21, 2026
Last Updated April 22, 2026
Researcher afnaan - SMKN 1 Bantul

Description

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 does not include a wp_nonce_field() and the form processing code does not call wp_verify_nonce() or check_admin_referer() before saving settings to the database via $wpdb->update(). This makes it possible for unauthenticated attackers to modify the plugin's CAPTCHA settings (enabling or disabling CAPTCHA on login, registration, lost password, and comment forms) via a forged request, granted they can trick a site administrator into performing an action such as clicking a link.

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Vulnerability Details for Kcaptcha

Kcaptcha

Software Type Plugin
Software Slug kcaptcha (view on wordpress.org)
Patched? No
Remediation No known patch available. Please review the vulnerability's details in depth and employ mitigations based on your organization's risk tolerance. It may be best to uninstall the affected software and find a replacement.
Affected Version
  • <= 1.0.1

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