CVE-2026-55126: 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-2026-55126) 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. An authorized attacker can exploit this flaw to conduct spoofing attacks over a network. The CVSS 3.1 base score is 7.3 (high), with network attack vector, low attack complexity, requiring privileges and user interaction, and resulting in high confidentiality and integrity impact. Microsoft has released an official fix for this issue.
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 impact on availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the patch provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55126 to remediate this vulnerability.
CVE-2026-55126: 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-2026-55126) 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. An authorized attacker can exploit this flaw to conduct spoofing attacks over a network. The CVSS 3.1 base score is 7.3 (high), with network attack vector, low attack complexity, requiring privileges and user interaction, and resulting in high confidentiality and integrity impact. Microsoft has released an official fix for this issue.
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 impact on availability. No known exploits are reported in the wild at this time.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the patch provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55126 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-06-16T15:03:49.680Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55126","vendor":"Microsoft"}]
Threat ID: 6a5676b568715ace43f0ab10
Added to database: 07/14/2026, 17:49:41 UTC
Last enriched: 07/14/2026, 19:06:02 UTC
Last updated: 07/15/2026, 01:07:33 UTC
Views: 3
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