Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://wordpress.org/plugins/cf7-conditional-fields/#developers
- https://www.vulncheck.com/advisories/conditional-fields-for-contact-form-7-dos-v
FAQ
What is CVE-2026-25863?
CVE-2026-25863 is a vulnerability with a CVSS score of 7.5 (HIGH). 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_field...
How severe is CVE-2026-25863?
CVE-2026-25863 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25863?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.