Authenticated content spoofing via undisclosed cross-site scripting
Published Apr 14, 2026 · Updated Apr 14, 2026
Cross-site scripting in Microsoft SharePoint Server allows remote authenticated users to spoof web content over a network. Microsoft identifies improper neutralization during web-page generation but has not disclosed the affected request, input field, or rendering routine that places attacker-controlled input into output. Exploitation requires SharePoint authorization and victim interaction; the reported consequence is deceptive page content rather than a service interruption.
Summary
What happened
Cross-site scripting in Microsoft SharePoint Server allows remote authenticated users to spoof web content over a network. Microsoft identifies improper neutralization during web-page generation but has not disclosed the affected request, input field, or rendering routine that places attacker-controlled input into output. Exploitation requires SharePoint authorization and victim interaction; the reported consequence is deceptive page content rather than a service interruption.
The record
- CVE
- CVE-2026-20945
- Published
- Apr 14, 2026
- Updated
- Apr 14, 2026
- Vendor
- Microsoft
- Product
- Microsoft SharePoint Enterprise Server 2016
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 14, 2026CVE publishedPublication date reported by the CVE source.
- Apr 14, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=16.0.0 <16.0.5548.1003
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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