CVE-2026-58644: Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
Other sources
Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.
— CISA
Microsoft SharePoint Remote Code Execution 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 16.0.19725.20384Patch KB5002873 - 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 16.0.10417.20153Patch KB5002874
Event History
Frequently Asked Questions
What is the severity of CVE-2026-58644?
The severity of CVE-2026-58644 is critical with a CVSS score of 9.8.
How does CVE-2026-58644 affect Microsoft SharePoint?
CVE-2026-58644 allows an unauthorized attacker to execute remote code due to deserialization of untrusted data in Microsoft SharePoint.
Which versions of Microsoft SharePoint are impacted by CVE-2026-58644?
CVE-2026-58644 affects Microsoft SharePoint, Microsoft SharePoint Server Subscription Edition, Microsoft SharePoint Enterprise Server 2016, and Microsoft SharePoint Server 2019.
What is the potential impact of CVE-2026-58644 on organizations?
Organizations could face significant risks including unauthorized code execution that may lead to data breaches or system compromise due to CVE-2026-58644.
How can I mitigate CVE-2026-58644?
To mitigate CVE-2026-58644, it is essential to apply the patches provided by Microsoft for the affected SharePoint versions.