CVE-2026-20963Microsoft SharePoint Deserialization of Untrusted Data Vulnerability
CISA Known Exploited Vulnerabilities Data
Description
Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.
Required Action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
CISA Due Date
March 21, 2026 (federal agency requirement)
Known Ransomware Campaign Use
Unknown
Notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20963 ; https://nvd.nist.gov/vuln/detail/CVE-2026-20963
External References
Concerned about this vulnerability affecting your clients?
Our team can help you assess exposure and plan remediation.
Data sourced from the CISA Known Exploited Vulnerabilities catalog. CISA does not endorse any commercial product or service.