CVE-2026-20963
Deserialization of Untrusted Data — is CVE-2026-20963real, exploitable, or a false positive? Here's the community ground truth.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Deserialization of untrusted data in Microsoft Office SharePoint allows an unauthorized attacker to execute code over a network.
NVD only has a brief summary for this one — the community fills in the real-world detail below.
References
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Field notes & remediation
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Microsoft SharePoint Deserialization of Untrusted Data Vulnerability — Microsoft SharePoint contains a deserialization of untrusted data vulnerability that allows an unauthorized attacker to execute code over a network. Listed in the CISA KEV catalog (added 2026-03-18) — confirmed exploited in the wild, not theoretical. FIRST EPSS puts the chance of exploitation in the next 30 days at ~31%. Treat it as real and prioritize remediation over triage.
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Required action for Microsoft SharePoint: 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 set a federal remediation due date of 2026-03-21. After patching, verify the vulnerable path is no longer reachable before closing the finding.
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Same weakness — CWE-502 · Deserialization of Untrusted Data.
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