CVE-2026-20959
MEDIUMCVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N
Lifecycle Timeline
2Description
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an authorized attacker to perform spoofing over a network.
Analysis
Stored XSS in Microsoft SharePoint Server enables authenticated users to inject malicious scripts that execute in other users' browsers, potentially leading to credential theft or session hijacking. The vulnerability requires user interaction and network access, but no patch is currently available, leaving organizations dependent on compensating controls or vendor updates.
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Verify Content-Security-Policy and output encoding.
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External POC / Exploit Code
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