What’s Vulnerable › Vulnerabilities

CVE-2026-34429: Vvveb < 1.0.8.1 Stored XSS via Media Upload and Rename

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-04-20 · updated 2026-10-26
• Weakness: CWE-79

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.

Affected products

• givanz Vvveb: before 1.0.8.1 — fixed in 1.0.8.1

How to fix

Upgrade to a fixed version: givanz Vvveb 1.0.8.1. Check the vendor advisory for mitigations.

References

• https://delta.cyberm.ca/bugbin/ur66bvB7BYTC9y0eCIk3uzhZQgbjzAkG/
• https://github.com/givanz/Vvveb/commit/cc997d3359ea5e49a45c132f5dee3bc80fb441d7
• https://github.com/givanz/Vvveb/releases/tag/1.0.8.1
• https://github.com/givanz/Vvveb/security/advisories/GHSA-2vc4-49hq-g7f4
• https://www.vulncheck.com/advisories/vvveb-stored-xss-via-media-upload-and-rename

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