CVE-2026-34429

Medium

Description

Vvveb prior to 1.0.8.1 contains a stored cross-site scripting vulnerability that allows authenticated users with media upload and rename permissions to execute arbitrary JavaScript by bypassing MIME type validation and renaming uploaded files to executable extensions. Attackers can prepend a GIF89a header to HTML/JavaScript payloads to bypass upload validation, rename the file to .html extension, and execute malicious scripts in an administrator's browser session to create backdoor accounts and upload malicious plugins for remote code execution.

SeverityMedium

CVSS5.4

Exploit probability—

ProductVvveb

PublishedApr 20, 2026

First seenApr 20, 2026

Weakness typeCWE-79Cross-site scripting (XSS)

How to fix

Update

givanz Vvveb1.0.8.1 or later

Patches

github.com/givanz/Vvveb/commit/cc997d3359ea5e49a45c132f5dee3bc80fb441d7

Vendor advisories

Affected products

Product	Affected versions	Fixed in
givanz Vvveb	v < 1.0.8.1	1.0.8.1

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