Conditional Fields for Contact Form 7, CVE-2026-25863

CVE, Research URL: CVE-2026-25863
Home page URL: Security reports for Conditional Fields for Contact Form 7
Application: Conditional Fields for Contact Form 7
Published on: May 05, 2026
Research Description: Conditional Fields for Contact Form 7 WordPress plugin through version 2.6.7 contains an uncontrolled resource consumption vulnerability in the Wpcf7cfMailParser class where the hide_hidden_mail_fields_regex_callback() method reads an iteration count directly from user-supplied POST parameters without validation or upper bound enforcement. Unauthenticated attackers can supply an arbitrarily large integer value through the REST API endpoint to cause unbounded loop execution with multiple preg_replace() operations, exhausting server memory and crashing the PHP process.
Affected versions: max 2.6.7.
Status: vulnerable