CVE-2026-34429CWE-79

Vvveb < 1.0.8.1 Stored XSS via Media Upload and Rename

Medium · published April 20, 2026

CVSS v4.0
5.1
EPSS
0%
Percentile
40.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v4.0
5.1 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
EPSS
0.00480 · 40.4th percentile
Weakness
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Published
2026-04-20T13:54Z
EPSS history
Timeline
  • 20 APR 13:54Z
    Vvveb < 1.0.8.1 Stored XSS via Media Upload and Rename
    cvelistv5