CVE-2026-6249Public exploitNetwork attack vector

Authenticated command execution via phtml media upload

Published Apr 20, 2026 · Updated Apr 20, 2026

Unrestricted file upload in Vvveb CMS before 1.0.8.2 allows remote authenticated users to execute OS commands via a .phtml file. The media handler's uploadDenyExtensions list omits phtml, so it stores attacker-supplied PHP in the publicly accessible media directory. A valid CMS login is required; requesting the uploaded file executes the webshell with the web server's privileges.

CVSS severity8.7
High
EPSS probability0.62%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in Vvveb CMS before 1.0.8.2 allows remote authenticated users to execute OS commands via a .phtml file. The media handler's uploadDenyExtensions list omits phtml, so it stores attacker-supplied PHP in the publicly accessible media directory. A valid CMS login is required; requesting the uploaded file executes the webshell with the web server's privileges.

The record

CVE
CVE-2026-6249
Published
Apr 20, 2026
Updated
Apr 20, 2026
Vendor
Vvveb
Product
Vvveb CMS
Classifications
CWE-434, T1505.003
Attack vector
network
Privileges
authenticated

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

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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 privilegesauthenticated

What is affected?

Vvveb · Vvveb CMSversion=1.0.8

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
8.8VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1505.003Server Software Component: Web Shell

Public exploit references

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

Technologies

Your stack

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Your stack

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