# CVE-2026-6257

> Vulnerability · severity: **CRITICAL** (CVSS 9.1).

## Description

Vvveb CMS prior to 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 facts

- **CVE ID:** CVE-2026-6257
- **Published:** 2026-04-20
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.1
- **CWE codes:** CWE-434

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-6257

## Citation

> AI Analytics. CVE-2026-6257. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-6257. Derived from NIST NVD. Licensed CC0.

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