CVE-2026-6257 Vvveb CMS < v1.0.8.2 Remote Code Execution via Media Management
Authenticated attackers can rename uploaded files to executable extensions to achieve remote code execution in Vvveb CMS.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-6257?
CVE-2026-6257 is a critical vulnerability in Vvveb CMS, published on 20 Apr 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Vvveb CMS before 1.0.8.2 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.
Weakness: CWE-434
Which versions are affected by CVE-2026-6257?
How do I fix CVE-2026-6257?
No fix has been published for CVE-2026-6257 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-6257 being exploited?
There is no known exploitation of CVE-2026-6257 in the wild and no public exploit code.
Sources
Also known as GHSA-c9rc-p9cp-2x7q.