EUVD-2026-14482
GHSA-wxjw-phj6-g75w
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
3Tags
Description
WWBN AVideo is an open source video platform. In versions up to and including 26.0, the `ImageGallery::saveFile()` method validates uploaded file content using `finfo` MIME type detection but derives the saved filename extension from the user-supplied original filename without an allowlist check. An attacker can upload a polyglot file (valid JPEG magic bytes followed by PHP code) with a `.php` extension. The MIME check passes, but the file is saved as an executable `.php` file in a web-accessible directory, achieving Remote Code Execution. Commit 345a8d3ece0ad1e1b71a704c1579cbf885d8f3ae contains a patch.
Analysis
WWBN AVideo versions up to and including 26.0 contain a critical file upload vulnerability in the ImageGallery::saveFile() method that allows authenticated attackers to upload polyglot files (JPEG with embedded PHP code) and achieve Remote Code Execution. The vulnerability exploits a mismatch between MIME type validation (which checks file content) and filename extension handling (which trusts user input), allowing attackers to bypass security controls and execute arbitrary code on the server. …
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Remediation
Within 24 hours: Inventory all WWBN AVideo deployments and their versions; restrict access to image upload functionality to trusted users only; enable comprehensive logging on file operations. Within 7 days: Apply the security patch from commit 345a8d3ece0ad1e1b71a704c1579cbf885d8f3ae or upgrade to the patched version; conduct logs review for suspicious upload activity. …
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