CVE-2026-55034: 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-2026-55034) in Microsoft SharePoint Enterprise Server 2016 is classified as CWE-79, indicating improper neutralization of input during web page generation, leading to cross-site scripting (XSS). An authorized attacker can exploit this flaw to conduct spoofing attacks over a network. The CVSS v3.1 base score is 7.3, reflecting high severity with network attack vector, low attack complexity, requiring privileges and user interaction, and impacts confidentiality and integrity. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows an authorized attacker to perform spoofing attacks, potentially compromising confidentiality and integrity of data within the affected SharePoint environment. There is no indication of availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55034 to remediate this vulnerability.
CVE-2026-55034: 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 7.3high
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-55034) in Microsoft SharePoint Enterprise Server 2016 is classified as CWE-79, indicating improper neutralization of input during web page generation, leading to cross-site scripting (XSS). An authorized attacker can exploit this flaw to conduct spoofing attacks over a network. The CVSS v3.1 base score is 7.3, reflecting high severity with network attack vector, low attack complexity, requiring privileges and user interaction, and impacts confidentiality and integrity. Microsoft has published an official fix for this vulnerability.
Potential Impact
Successful exploitation allows an authorized attacker to perform spoofing attacks, potentially compromising confidentiality and integrity of data within the affected SharePoint environment. There is no indication of availability impact. No known exploits in the wild have been reported.
Mitigation Recommendations
An official fix is available from Microsoft. Administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55034 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T14:13:49.835Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55034","vendor":"Microsoft"}]
Threat ID: 6a5676b068715ace43f098c2
Added to database: 07/14/2026, 17:49:36 UTC
Last enriched: 07/14/2026, 19:34:10 UTC
Last updated: 07/15/2026, 01:47:36 UTC
Views: 3
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