CVE-2026-126378

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

Published Nov 13, 2026 CVSS 4.0 · 9.4 Critical EPSS n/a KEV · Not listed
Description
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.

Analysis

No analysis available yet

Remediation

No remediation available yet

Tracking

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Advisories

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History
Type Values Removed Values Added
Description 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.
Title Vvveb through 1.0.8.6 Webshell Upload via Theme Installer validFile() Bypass
First Time appeared Vvveb
Vvveb vvveb
Weaknesses CWE-434
CPEs cpe:2.3:a:vvveb:vvveb:*:*:*:*:*:*:*:*
Vendors & Products Vvveb
Vvveb vvveb
References
Metrics cvssV3_1

{'score': 9.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.4, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Weaknesses
  • CWE-434

    Unrestricted Upload of File with Dangerous Type

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 13, 2026, 9:36 AM
Reserved
Nov 10, 2026, 9:25 PM
Status
Deferred
Published
Nov 13, 2026, 10:17 AM
Modified
Nov 13, 2026, 10:17 AM