CVE-2026-55030: 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-2026-55030) affects Microsoft SharePoint Enterprise Server 2016 version 16.0.0. It is classified as CWE-79, indicating improper neutralization of input during web page generation, which leads to cross-site scripting (XSS). The flaw allows an attacker with authorized access to craft malicious input that is not properly sanitized, enabling spoofing attacks over a network. The CVSS v3.1 base score is 4.6 (medium severity), with network attack vector, low attack complexity, requiring privileges and user interaction, and impacts confidentiality and integrity with no availability impact. Microsoft has issued an official fix for this vulnerability.
Potential Impact
An authorized attacker can exploit this XSS vulnerability to perform spoofing attacks over a network, potentially leading to limited confidentiality and integrity impacts. The vulnerability does not affect availability. 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 version 16.0.0 should apply the vendor-provided patch as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55030.
CVE-2026-55030: 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
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-55030) affects Microsoft SharePoint Enterprise Server 2016 version 16.0.0. It is classified as CWE-79, indicating improper neutralization of input during web page generation, which leads to cross-site scripting (XSS). The flaw allows an attacker with authorized access to craft malicious input that is not properly sanitized, enabling spoofing attacks over a network. The CVSS v3.1 base score is 4.6 (medium severity), with network attack vector, low attack complexity, requiring privileges and user interaction, and impacts confidentiality and integrity with no availability impact. Microsoft has issued an official fix for this vulnerability.
Potential Impact
An authorized attacker can exploit this XSS vulnerability to perform spoofing attacks over a network, potentially leading to limited confidentiality and integrity impacts. The vulnerability does not affect availability. 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 version 16.0.0 should apply the vendor-provided patch as detailed in the Microsoft Security Response Center advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55030.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T14:12:44.285Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55030","vendor":"Microsoft"}]
Threat ID: 6a5676b068715ace43f098b6
Added to database: 07/14/2026, 17:49:36 UTC
Last enriched: 08/13/2026, 15:31:56 UTC
Last updated: 08/28/2026, 19:39:45 UTC
Views: 72
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