CVE-2026-6257

Critical

Description

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.

SeverityCritical

CVSS9.1

Exploit probability—

Product

Vvveb CMS

PublishedApr 20, 2026

First seenApr 20, 2026

Weakness typeCWE-434Unrestricted upload of dangerous file type

How to fix

Update

Vvveb Vvveb CMS1.0.8.2 or later

Patches

github.com/givanz/Vvveb/commit/6fb8eaa998265e33e8802cbc220d8859dbc144f2

Affected products

Product	Affected versions	Fixed in
Vvveb Vvveb CMS	v < 1.0.8.2	1.0.8.2

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