CVE-2026-20945: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Microsoft Microsoft SharePoint Enterprise Server 2016
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.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-20945) affects Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) and is classified as CWE-79: Improper Neutralization of Input During Web Page Generation, commonly known as cross-site scripting (XSS). It allows an authorized attacker to inject malicious input that is not properly sanitized, leading to spoofing attacks over a network. The CVSS 3.1 base score is 4.6 (medium severity), with vector AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N, indicating network attack vector, low complexity, required privileges, and user interaction. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized attacker with some privileges can exploit this vulnerability to perform cross-site scripting attacks, potentially leading to spoofing. The impact includes limited confidentiality and integrity loss but no availability impact. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users of Microsoft SharePoint Enterprise Server 2016 should apply the vendor-provided patch as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20945 to remediate this vulnerability.
CVE-2026-20945: CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Microsoft Microsoft SharePoint Enterprise Server 2016
Description
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.
CVSS v3.1
Score 4.6medium
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-20945) affects Microsoft SharePoint Enterprise Server 2016 (version 16.0.0) and is classified as CWE-79: Improper Neutralization of Input During Web Page Generation, commonly known as cross-site scripting (XSS). It allows an authorized attacker to inject malicious input that is not properly sanitized, leading to spoofing attacks over a network. The CVSS 3.1 base score is 4.6 (medium severity), with vector AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N, indicating network attack vector, low complexity, required privileges, and user interaction. Microsoft has published an official fix for this vulnerability.
Potential Impact
An authorized attacker with some privileges can exploit this vulnerability to perform cross-site scripting attacks, potentially leading to spoofing. The impact includes limited confidentiality and integrity loss but no availability impact. There are no known exploits in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users of Microsoft SharePoint Enterprise Server 2016 should apply the vendor-provided patch as detailed in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20945 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2025-12-04T20:04:16.339Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20945","vendor":"Microsoft"}]
Threat ID: 69de7a1482d89c981fd6a5e9
Added to database: 4/14/2026, 5:32:04 PM
Last enriched: 5/19/2026, 10:31:53 AM
Last updated: 5/31/2026, 5:35:47 AM
Views: 45
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