CVE-2026-55034: Microsoft SharePoint Server Spoofing Vulnerability
Published Jul 14, 2026
·Updated
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.
Other sources
Microsoft SharePoint Server Spoofing Vulnerability
— Microsoft
Affected Software
6 affected componentsFixes available
Microsoft SharePoint Server Subscription Edition<16.0.19725.20434
16.0.19725.20434
Microsoft SharePoint Server 2019<16.0.10417.20175
16.0.10417.20175
Microsoft SharePoint Enterprise Server 2016<16.0.5561.1001
16.0.5561.1001
Microsoft SharePoint Server<16.0.19725.20434
Microsoft SharePoint Server=2016
Microsoft SharePoint Server=2019
Remediation
Event History
Jul 14, 2026
CVE Published
via Microsoft·02:00 PM
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeakness
Data Sourced
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Affected Software
Updated
via Microsoft·02:00 PM
Description
CVE Published
via MITRE·05:08 PM
Data Sourced
via MITRE·05:08 PM
DescriptionSeverity
Data Sourced
via NVD·06:18 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-55034?
The severity of CVE-2026-55034 is classified as high with a score of 8.7.
2
How do I fix CVE-2026-55034?
To fix CVE-2026-55034, apply the available patches from Microsoft.
3
What software is affected by CVE-2026-55034?
CVE-2026-55034 affects Microsoft SharePoint Server, SharePoint Server Subscription Edition, SharePoint Server 2019, and SharePoint Enterprise Server 2016.
4
What type of vulnerability is CVE-2026-55034?
CVE-2026-55034 is a spoofing vulnerability caused by improper neutralization of input during web page generation.
5
Can an attacker exploit CVE-2026-55034 remotely?
Yes, an authorized attacker can exploit CVE-2026-55034 remotely over a network.