CVE-2026-1944: Krellbat Callbackkiller Service Widget

Medium severity, CVSS 5.3. EPSS: 0.4% chance of exploitation in the next 30 days.

The CallbackKiller service widget plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the cbk_save() function in all versions up to, and including, 1.2. This makes it possible for unauthenticated attackers to modify the plugin's site ID settings via the 'cbk_save_v1' AJAX action.

Affected products

• Krellbat Callbackkiller Service Widget: up to and including 1.2

Published 2026-02-14. Last modified 2026-06-17.