_layouts/Upload.aspx in the Documents module in Microsoft SharePoint before 2010 uses URLs with the same hostname and port number for a web site's primary files and individual users' uploaded files (aka attachments), which allows remote authenticated users to leverage same-origin relationships and conduct cross-site scripting (XSS) attacks by uploading TXT files, a related issue to CVE-2008-5026. NOTE: the vendor disputes the significance of this issue, because cross-domain isolation can be implemented when needed.
CVSS Severity (version 2.0):
Impact Subscore: 2.9
Exploitability Subscore: 6.8
CVSS Version 2 Metrics:
Access Vector: Network exploitable; Victim must voluntarily interact with attack mechanism
Access Complexity: Medium
Authentication: Required to exploit
Impact Type: Allows unauthorized modification
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20100222 Hacktics Advisory Feb10: Persistent XSS in Microsoft SharePoint Portal
Vulnerable software and versions