What is CVE-2026-6257?

CVE-2026-6257 is a critical-severity vulnerability in Vvveb Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2026-04-20.

How severe is CVE-2026-6257?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Arbitrary file upload in Vvveb Cms

CVE-2026-6257

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 o…

Vulnerability class: Unrestricted File Upload

EPSS: 0.001 (30.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H.

Affected products

Vvveb Cms — versions 1.0.8, 1.0.8.2

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

disclosure@vulncheck.com
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-6257?: CVE-2026-6257 is a critical-severity vulnerability in Vvveb Cms, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2026-04-20.
How severe is CVE-2026-6257?: Critical severity. CVSS v3 base score is 9.1 out of 10.