Is CVE-2026-4121 actively exploited?

No active exploitation of CVE-2026-4121 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-4121 be exploited remotely?

Yes. CVE-2026-4121 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-4121?

CVE-2026-4121 has a CVSS score of 4.3 (MEDIUM).

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MEDIUM

CVE-2026-4121

CWE-352Published: April 22, 2026· Updated: Apr 22, 2026

4.3

CVSS v3.1

EPSS:0.01%probability of exploitation in 30 daysPercentile:0.4th

Official 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.

NVD Source

Technical Analysis

CVE-2026-4121 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.