Patch tracker / KB5002824
KB5002824: Office Online Server Security Update (January 2026)
KB5002824 is a High security update for Office Online Server, released 2026-01-13. It closes 3 CVEs with a maximum CVSS of 7.8. Get it from the Microsoft Update Catalog below, and see where it sits against the rest of the month on the patch tracker.
Update summary
New to these terms? How the Microsoft patching tools fit together, this month's Patch Tuesday summary, and every update ranked by real-world risk.
Senserva AI Opinion for KB5002824
KB5002824 patches three CVEs across Office Online Server and Office 2019 in both 32-bit and 64-bit editions, with the most serious rated High at CVSS 7.8. Exposure spans both the server-side Office Online Server component and desktop Office 2019 installs, so a single KB touches two distinct deployment types. None of the three CVEs are in CISA KEV or linked to ransomware, and the highest EPSS sits at 1 percent, indicating no observed exploitation yet.
Do this: Deploy KB5002824 to your Office Online Server instances first, since a shared server component reaches more users than individual Office 2019 desktops.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5002824
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5002824
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.
Exploitation and severity
Fixes 3 CVEs. Most severe CVSS 7.8 (High). EPSS exploit probability up to <1%.
Among the lower half of tracked Microsoft updates by EPSS exploit probability.
What to do
Moderate priority: schedule it in your normal patch cycle. Senserva flags whether KB5002824 is missing on your devices.
Check if KB5002824 is installed
Copy-paste PowerShell: one machine, or your whole estate in one pass. No output means the update is not installed.
Get-HotFix covers Windows updates. Office, SharePoint, and Exchange server updates show under installed updates in Programs and Features, or check the Update Catalog history.
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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2026-20950 | High | 7.8 | <1% | No |
| CVE-2026-20955 | High | 7.8 | <1% | No |
| CVE-2026-20957 | High | 7.8 | <1% | No |
Affected products
Also released in January 2026
The highest-risk updates from the same release:
The full month, summarized: Microsoft Patch Tuesday.
Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.