CVE-2026-55135: 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-2026-55135) 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, leading to cross-site scripting. An authorized attacker could exploit this flaw to perform spoofing attacks over a network. The CVSS 3.1 base score is 4.6, reflecting a medium severity with network attack vector, low attack complexity, requiring privileges and user interaction, and impacts on confidentiality and integrity. Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation could allow an authorized attacker to conduct spoofing attacks, potentially compromising confidentiality and integrity of information within the affected SharePoint environment. There is no indication of availability impact or 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 advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55135 to remediate this vulnerability.
CVE-2026-55135: 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-2026-55135) 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, leading to cross-site scripting. An authorized attacker could exploit this flaw to perform spoofing attacks over a network. The CVSS 3.1 base score is 4.6, reflecting a medium severity with network attack vector, low attack complexity, requiring privileges and user interaction, and impacts on confidentiality and integrity. Microsoft has released an official fix to address this issue.
Potential Impact
Successful exploitation could allow an authorized attacker to conduct spoofing attacks, potentially compromising confidentiality and integrity of information within the affected SharePoint environment. There is no indication of availability impact or 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 advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55135 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T15:03:49.681Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55135","vendor":"Microsoft"}]
Threat ID: 6a5676b668715ace43f0ab83
Added to database: 07/14/2026, 17:49:42 UTC
Last enriched: 07/14/2026, 19:04:39 UTC
Last updated: 07/15/2026, 01:07:23 UTC
Views: 3
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