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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.

PUBLISHED Reserved 2026-03-27 | Published 2026-04-20 | Updated 2026-04-20 | Assigner VulnCheck




MEDIUM: 5.1CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

MEDIUM: 5.4CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Problem types

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status
unaffected

Any version before 1.0.8.1
affected

cc997d3359ea5e49a45c132f5dee3bc80fb441d7 (git)
unaffected

Credits

Hamed Kohi finder

VulnCheck coordinator

References

delta.cyberm.ca/bugbin/ur66bvB7BYTC9y0eCIk3uzhZQgbjzAkG/ technical-description exploit

github.com/givanz/Vvveb/releases/tag/1.0.8.1 release-notes

github.com/...ommit/cc997d3359ea5e49a45c132f5dee3bc80fb441d7 patch

www.vulncheck.com/...-stored-xss-via-media-upload-and-rename third-party-advisory

cve.org (CVE-2026-34429)

nvd.nist.gov (CVE-2026-34429)

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