CVE-2026-6257Network attack vector

Authenticated code execution via blocked-extension rename

Published Apr 20, 2026 · Updated Apr 20, 2026

Remote code execution in Vvveb CMS 1.0.8 allows remote authenticated users to execute operating system commands through media renames. The rename() handler in system/traits/media.php detects .php and .htaccess as denied extensions but continues into the filesystem rename because the rejection branch lacks a return. Administrative media access permits chaining an .htaccess PHP-handler injection with a renamed PHP payload, which runs with the web server account's privileges.

CVSS severity9.2
Critical
EPSS probability0.63%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Remote code execution in Vvveb CMS 1.0.8 allows remote authenticated users to execute operating system commands through media renames. The rename() handler in system/traits/media.php detects .php and .htaccess as denied extensions but continues into the filesystem rename because the rejection branch lacks a return. Administrative media access permits chaining an .htaccess PHP-handler injection with a renamed PHP payload, which runs with the web server account's privileges.

The record

CVE
CVE-2026-6257
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
Vvveb
Product
Vvveb CMS
Classifications
CWE-434, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.0.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Vvveb · Vvveb CMSversion=1.0.8

Published CVSS scores

9.2VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:H/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo