Patch tracker / KB5002946
KB5002946: Office Online Server Security Update (November 2026)
KB5002946 is a High security update for Office Online Server, released 2026-11-10. It closes 56 CVEs with a maximum CVSS of 8.8. It is the 12th largest of the 27 updates Microsoft shipped that month, by CVEs closed.
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Update summary
Fixes 56 CVEs. Most severe CVSS 8.8 (High).
We checked Microsoft's support article for KB5002946 on 2026-11-12 and it lists no known issues. Read the article before broad deployment; Microsoft adds issues as reports come in, and we re-check on every refresh.
KB5002946 is the November 2026 security update for Office Online Server and fixes 56 CVEs, an unusually large batch for a single server-side Office component, with a highest Severity of High (CVSS 8.8). None of the listed CVEs appear in the CISA KEV catalog and none are tied to ransomware, so this is a volume and exposure problem rather than a known-exploitation emergency. Organizations running Office Online Server for browser-based document viewing and editing, especially instances reachable from outside the network, carry the most risk.
Do this: Identify every Office Online Server farm node, deploy KB5002946 to a test node first, then roll it across the farm and verify document viewing and editing still work, starting with any internet-facing instances.
AI-generated from public data, 2026-11-10. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5002946
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5002946
- Released
- 2026-11-10
- Last changed
- 2026-11-10
- Changes tracked
- 1
Senserva began recording day-to-day change history on 2026-07-07, and refreshes it several times a day. Release dates are historical where Microsoft publishes them; revision history is tracked from that date forward, so it does not include changes made before then.
Check if KB5002946 is installed
This update is for Office Online Server, not a Windows component, so Get-HotFix does not list it. Compare the installed version of the product with the build Microsoft lists for this update.
CVEs fixed by this update
Sorted exploited-first, then by CVSS. Every CVE links to its Senserva page with the full risk facts, references, and a ready-to-paste AI prompt.
Scope and sources
- Affected products
- Also released in November 2026
KB5002945
24 CVEs · CriticalKB5129299
57 CVEs · CriticalKB5129300
54 CVEs · CriticalKB5131077
625 CVEs · CriticalKB5131080
627 CVEs · CriticalKB5131085
575 CVEs · CriticalKB5131087
574 CVEs · CriticalKB5131090
592 CVEs · CriticalThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.