Is CVE-2026-6257 actively exploited?

CVE-2026-6257 has no public evidence of in-the-wild exploitation as of 2026-04-20.

What is the CVSS score for CVE-2026-6257?

CVE-2026-6257 has a CVSS score of 9.2 (CRITICAL severity). 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X.

How do I patch CVE-2026-6257?

Vendor patch guidance is linked from the references on this page. CVEDatabase generates AI-assisted remediation guidance on demand for CVE-2026-6257.

Which products are affected by CVE-2026-6257?

Affected products for CVE-2026-6257 are listed on this page once vendor data becomes available.

Fix CVE-2026-6257 - CRITICAL Vulnerability

Description

Vvveb CMS v1.0.8 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.

CVSS Metrics

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector: network
Complexity: low
Privileges: high
User Action: none
Confidentiality: undefined
Integrity: undefined
Availability: undefined
Weaknesses: CWE-434 · Unrestricted File Upload

Metadata

Primary Vendor: UNKNOWN
Published: 4/20/2026
Last Modified: 4/20/2026
Source: NIST NVD
Note: Verify all details with official vendor sources before applying patches.

CVE-2026-6257

Description

CVSS Metrics

Metadata

Affected Products

Remediation Guidance

Executive Summary