CVE-2026-25863: Jules Colle Conditional Fields For Contact Form 7

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Conditional Fields for Contact Form 7 WordPress plugin through version 2.7.2 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 products

• Jules Colle Conditional Fields For Contact Form 7: before 2.7.3 (fixed in 2.7.3)

Published 2026-05-04. Last modified 2026-06-17.