Arbitrary file upload in Htplugins Extensions For Cf7 (Contact Form 7 Database, Conditional Fields And Redirection)

CVE-2026-94589

The Extensions For CF7 (Contact form 7 Database, Conditional Fields and Redirection) plugin for WordPress is vulnerable to Arbitrary File Upload in all versions up to, and including, 3.4.5 via the extcf7_submit function. This is due to missing file extension, MIME type, and size validation in the signature field's validation_filter(), combined with the absence of PHP-execution guards in the upload directory and a sanitize_file_name() bypass that converts shell.php- into shell.php. This makes it possible for unauthenticated attackers to upload files that may be executable, which makes remote code execution possible.

Vulnerability class: Unrestricted File Upload

Published .

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-94589?
CVE-2026-94589 is a critical-severity vulnerability in Htplugins Extensions For Cf7 (Contact Form 7 Database, Conditional Fields And Redirection), classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.8/10. Published 2026-10-10.
How severe is CVE-2026-94589?
Critical severity. CVSS v3 base score is 9.8 out of 10.