CVE-2026-6257 CRITICAL

CVE-2026-6257: Vvveb CMS < v1.0.8.2 Remote Code Execution via Media Management

Vendor Vvveb
Product Vvveb CMS
Weakness CWE-434 · Unrestricted file upload
Published April 20, 2026
Last update May 25, 2026

CVSS base score

9.2/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality
Integrity

CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:H/SA:N

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

April 20, 2026 CVE published
May 25, 2026 Record updated