Vulnerability in Jules Colle Conditional Fields For Contact Form 7
CVE-2026-25863
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.006 (46.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.006 · change: +0.002
Affected products
- Jules Colle Conditional Fields For Contact Form 7 — versions 0
Weakness classification (CWE)
References
- wordpress.org/plugins/cf7-conditional-fields/ (release-notes, patch)
- www.vulncheck.com/advisories/conditional-fields-for-contact-form-7-dos-via-unco… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-25863?
- CVE-2026-25863 is a high-severity vulnerability in Jules Colle Conditional Fields For Contact Form 7, classified under Improper Validation of Specified Quantity in Input. CVSS score: 7.5/10. Published 2026-05-04.
- How severe is CVE-2026-25863?
- High severity. CVSS v3 base score is 7.5 out of 10.