CVE-2026-50522: 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 which could allow 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 16.0.19725.20434Patch KB5002882 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.10417.20175Patch KB5002883 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 16.0.5561.1001Patch KB5002891
Event History
Frequently Asked Questions
What is the severity of CVE-2026-50522?
CVE-2026-50522 is rated as critical with a severity score of 9.8.
What systems are affected by CVE-2026-50522?
CVE-2026-50522 affects Microsoft SharePoint Server 2019, Microsoft SharePoint Server Subscription Edition, and Microsoft SharePoint Enterprise Server 2016.
How does CVE-2026-50522 exploit work?
CVE-2026-50522 exploits the deserialization of untrusted data in Microsoft SharePoint, allowing unauthorized code execution over a network.
How do I mitigate CVE-2026-50522?
To mitigate CVE-2026-50522, ensure that you apply the latest security updates provided by Microsoft for SharePoint.
Can CVE-2026-50522 lead to data breaches?
Yes, CVE-2026-50522 can lead to critical data breaches due to remote code execution capabilities.