CVE-2026-55126 Details
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.
A cross-site scripting vulnerability has been identified in Microsoft SharePoint, allowing an authorized attacker to perform spoofing over the network. This issue arises from improper neutralization of input during web page generation. The vulnerability affects multiple SharePoint products, including SharePoint Server 2016, SharePoint Server Subscription Edition, and SharePoint Server 2019.
Users can download the security update for their respective SharePoint version from the Microsoft Update Catalog. Instructions for applying the update are available in the Knowledge Base articles linked in the 'Security Updates' section.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jul 13, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-55126 | [email protected] | PatchVendor Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-79 | Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| microsoft sharepoint server | < 16.0.19725.20434 2016 2019 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 16, 2026 | Initial Analysis | [email protected] |
| Jul 15, 2026 | CVE Modified | CISA-ADP |
| Jul 14, 2026 | CVE Modified | CISA-ADP |
| Jul 14, 2026 | New CVE Received | [email protected] |