CVE-2026-6257: Vvveb CMS

Critical severity, CVSS 9.1. EPSS: 0.9% chance of exploitation in the next 30 days.

Vvveb CMS v1.0.8.2 contains a remote code execution vulnerability in its media management functionality where a missing return statement in the file rename handler allows authenticated attackers to rename files to blocked extensions .php or .htaccess. Attackers can exploit this logic flaw by first uploading a text file and renaming it to .htaccess to inject Apache directives that register PHP-executable MIME types, then uploading another file and renaming it to .php to execute arbitrary operating system commands as the www-data user.

Affected products

• Vvveb Vvveb CMS: version 1.0.8.2 only

Published 2026-04-20. Last modified 2026-06-17.