CVE-2026-70321: Microsoft SharePoint Remote Code Execution Vulnerability
Published Aug 11, 2026
·Updated
Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.
Other sources
Microsoft SharePoint Remote Code Execution Vulnerability
— Microsoft
Affected Software
2 affected componentsFixes available
Microsoft SharePoint Server Subscription Edition<16.0.19725.20522
16.0.19725.20522
Microsoft SharePoint Server<16.0.19725.20522
Remediation
Event History
Aug 11, 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
Description
CVE Published
via MITRE·05:05 PM
Data Sourced
via MITRE·05:05 PM
DescriptionSeverity
Data Sourced
via NVD·05:19 PM
RemedyDescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-70321?
CVE-2026-70321 has a high severity score of 8.8.
2
How do I fix CVE-2026-70321?
To fix CVE-2026-70321, apply the available patch from Microsoft.
3
What types of attacks can CVE-2026-70321 lead to?
CVE-2026-70321 can lead to remote code execution attacks.
4
Which software is affected by CVE-2026-70321?
CVE-2026-70321 affects Microsoft SharePoint Server Subscription Edition and Microsoft SharePoint Server.
5
Who is at risk with CVE-2026-70321?
Authorized attackers who exploit the vulnerability can execute code over the network.