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Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network.
CISA lists CVE-2026-20963 as known exploited in the wild for Microsoft SharePoint. Ransomware campaign use: Unknown. Federal remediation due date: 2026-03-21.
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.