Patch tracker / CVE reference / CVE-2026-20963
CVE-2026-20963
CVE-2026-20963 is a critical severity Microsoft vulnerability with a CVSS score of 9.8. It is in the CISA Known Exploited Vulnerabilities catalog: attackers are using it in the wild, which makes it a fix-first item. Microsoft has shipped the fix: deploy one of the 3 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
Risk summary
Listed in the CISA Known Exploited Vulnerabilities catalog, confirmed exploited in the wild. EPSS exploit probability 32%. CVSS 9.8 (Critical).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability, and one of 3 actively-exploited CVEs in January 2026.
This is an unauthenticated remote code execution flaw in on-premises SharePoint (2016, 2019, and Subscription Edition) that CISA confirmed as actively exploited and added to the KEV catalog on 2026-03-18. Any organization running self-hosted SharePoint servers reachable by users or the internet is exposed, and the 23 percent EPSS score combined with confirmed exploitation means attackers are already targeting it. SharePoint servers often hold sensitive documents and hold privileged service accounts, making a compromise a springboard into the wider environment.
Do this: Apply Microsoft's patch for CVE-2026-20963 to all SharePoint 2016, 2019, and Subscription Edition servers now, prioritizing any instances exposed to the internet.
AI-generated from public data, 2026-07-26. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-20963
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Official patch(es) for CVE-2026-20963
Treat as urgent: it is being exploited in the wild (CISA KEV), so patch ahead of items that are not. In Intune or Defender, confirm whether the fixing updates KB5002822, KB5002825, KB5002828 are installed across the affected products. Senserva does this automatically across your tenant and flags every missing patch.
Apply the Microsoft security updates below to fix CVE-2026-20963. Each KB page carries the Microsoft Update Catalog download, Microsoft's known issues for the update, a copy-paste PowerShell check for whether it is installed, and the Senserva AI read.
Scope and sources
- Affected products
- Fixed by the same updates
- Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.