Patch tracker / CVE reference / CVE-2026-20950
CVE-2026-20950
CVE-2026-20950 is a high severity Microsoft vulnerability with a CVSS score of 7.8. Microsoft has shipped the fix: deploy one of the 2 updates below from the Microsoft Update Catalog, and see where this CVE sits against the rest on the patch tracker.
High severity Microsoft vulnerability, CVSS 7.8. Fixed by 2 Microsoft security updates.
Risk summary
Senserva AI Opinion for CVE-2026-20950
CVE-2026-20950 is a High severity (CVSS 7.8) remote code execution flaw in Microsoft Excel that spans Office Online Server and Microsoft Office 2019 for both 32-bit and 64-bit editions. The 7.8 score with local attack characteristics points to a malicious Excel file opened by a user rather than a network worm, and the EPSS estimate sits at just 1 percent with no confirmed exploitation in CISA KEV. The presence of Office Online Server in the affected list matters because it puts this in the server-side document rendering path, not only on individual desktops.
Do this: Deploy the Microsoft Excel security update across Office 2019 32-bit and 64-bit installs and any Office Online Server instances, prioritizing the servers that render user-supplied documents.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for CVE-2026-20950
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Updated August 7, 2026. Data refreshed on every build from MSRC, CISA KEV, and FIRST EPSS.
Full tracking and change history for CVE-2026-20950
Published and last-revised dates are authoritative, from Microsoft MSRC (or the CISA KEV date-added). Senserva additionally records day-to-day changes from 2026-07-07, refreshed several times a day; the change count reflects that forward-only tracking.
Exploitation and severity
Not in the CISA KEV catalog. EPSS exploit probability <1%. CVSS 7.8 (High).
This CVE is among the lower half of tracked Microsoft CVEs by EPSS exploit probability.
Official patch(es) for CVE-2026-20950
Moderate priority: schedule it in your normal patch cycle. In Intune or Defender, confirm whether the fixing updates KB5002824, KB5002831 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-2026-20950. 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.
Affected products
Fixed by the same updates
If you are patching CVE-2026-20950, the same updates also fix these:
Authoritative references
Want every Microsoft CVE and the patches that fix it, ranked by real-world risk? See the Microsoft Patch Tracker.