uploadimg.php in the Automatic Image Upload with Thumbnails (imgUpload) module 1.3.2 for PunBB only verifies the Content-type field of uploaded files, which allows remote attackers to upload and execute arbitrary content via a file with a (1) JPG, (2) GIF, or (3) PNG MIME type.
CVSS Severity (version 2.0):
Impact Subscore: 4.9
Exploitability Subscore: 8.6
CVSS Version 2 Metrics:
Access Vector: Network exploitable; Victim must voluntarily interact with attack mechanism
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized disclosure of information; Allows unauthorized modification
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Vulnerable software and versions