CVE-2026-20963: listed in the CISA KEV catalog

CVE-2026-20963 · CVSS 8.8 HIGH · EPSS 32% · KEV 2026-03-18

Deserialization of untrusted data in Microsoft Office SharePoint allows an authorized attacker to execute code over a network.

Is CVE-2026-20963 exploited?

• Listed in the CISA KEV catalog on 2026-03-18.
• Federal remediation due 2026-03-21.
• Past that date by 147 days.
• EPSS puts exploitation in the next 30 days at 32%.
• Public exploit code: none found in monitored sources.

Which products and versions are affected?

No affected package list recorded here yet.

Is there a patch?

No patch identifier recorded here yet.

What PlainSec published about CVE-2026-20963

• Unauthenticated RCE in SharePoint Rated Critical (2026-03-26)
• Critical SharePoint Server Flaw Now Exploited in Wild (2026-03-24)

Primary sources

• NVD record
• CISA KEV catalog

What this record does not say

• No affected package data.
• No patch identifier.

KEV and EPSS are re-checked daily. Record last updated 2026-08-12.