Vulnerability · Published Apr 20, 2026 · Assigned by VulnCheck

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

Medium 5.4

In plain English

A medium-severity cross-site scripting in Vvveb from givanz. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 79.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official 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 (as reported)

Vendor	Product	Versions
givanz	Vvveb	0 – before 1.0.8.1

Weakness: CWE-79 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

References

https://delta.cyberm.ca/bugbin/ur66bvB7BYTC9y0eCIk3uzhZQgbjzAkG/ technical-description, exploit
https://github.com/givanz/Vvveb/security/advisories/GHSA-2vc4-49hq-g7f4 vendor-advisory
https://github.com/givanz/Vvveb/releases/tag/1.0.8.1 release-notes
https://github.com/givanz/Vvveb/commit/cc997d3359ea5e49a45c132f5dee3bc80fb441d7 patch
https://www.vulncheck.com/advisories/vvveb-stored-xss-via-media-upload-and-rename third-party-advisory