CVE-2026-45453: Microsoft SharePoint Server Spoofing Vulnerability
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
Improper neutralization of input during web page generation ('cross-site scripting') in Microsoft Office SharePoint allows an unauthorized attacker to perform spoofing over a network.
— NVD
Microsoft SharePoint Server Spoofing Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20153Patch KB5002874 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5556.1005Patch KB5002880 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.19725.20384Patch KB5002873
Event History
Frequently Asked Questions
What is the severity of CVE-2026-45453?
The severity of CVE-2026-45453 is rated as medium with a score of 5.4.
What is CVE-2026-45453 related to?
CVE-2026-45453 is related to a spoofing vulnerability in Microsoft SharePoint Server caused by improper input neutralization during web page generation.
How do I fix CVE-2026-45453?
To fix CVE-2026-45453, apply the latest patches and updates provided by Microsoft for affected SharePoint Server versions.
What impact does CVE-2026-45453 have on Microsoft SharePoint?
CVE-2026-45453 allows an authorized attacker to perform spoofing attacks over a network due to cross-site scripting vulnerabilities.
Which versions of Microsoft SharePoint are affected by CVE-2026-45453?
CVE-2026-45453 affects Microsoft SharePoint Server, Microsoft SharePoint Server Subscription Edition, Microsoft SharePoint Server 2019, and Microsoft SharePoint Enterprise Server 2016.