CVE-2026-126378

CRITICAL 9.1

Vvveb through 1.0.8.6 Webshell Upload via Theme Installer validFile() Bypass

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

Vvveb through 1.0.8.6 contains a file upload vulnerability in the theme installer validFile() function that uses strpos() instead of strict path matching. Attackers with admin credentials can upload a ZIP containing a PHP file whose path includes /theme.php to achieve remote code execution on nginx deployments.

CWE	CWE-434
Vendor	givanz
Product	vvveb
Published	Nov 13, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

Affected Versions

givanz / Vvveb

0 ≤ 1.0.8.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/givanz/Vvveb/security/advisories/GHSA-xpgr-r6c8-3hpq vulncheck.com: https://www.vulncheck.com/advisories/vvveb-through-1.0.8.6-webshell-upload-via-theme-installer-validfile-bypass

Credits

🔍 de3erve-hunter