CVE-2026-45659—Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability
PUBLISHEDvulnerability record
2026-07-01 · last modified July 3, 2026
Metadata
Vulnerability Name
Microsoft SharePoint Server Deserialization of Untrusted Data Vulnerability
Description
Microsoft SharePoint Server contains a deserialization of untrusted data vulnerability which allows an authorized attacker to execute code over a network.
Known To Be Used in Ransomware Campaigns?
Action
Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.