Patch tracker / KB5002846
KB5002846: Office Online Server Security Update (March 2026)
KB5002846 is a High security update for Office Online Server, released 2026-03-10. It closes 4 CVEs with a maximum CVSS of 8.4. 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 KB5002846
KB5002846 patches four CVEs across Office Online Server and both 32-bit and 64-bit editions of Office 2019, with the most serious rated High at CVSS 8.4. The Office Online Server exposure is what stands out here, since that role often sits closer to internet-facing document workflows than a typical desktop Office install. EPSS is currently 0% and none of the four CVEs are in CISA KEV or linked to ransomware, so this is planned patching rather than emergency response.
Do this: Schedule KB5002846 across your Office 2019 fleet and prioritize your Office Online Server instances first given their broader reach.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5002846
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5002846
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 4 CVEs. Most severe CVSS 8.4 (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 KB5002846 is missing on your devices.
Check if KB5002846 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-2026-26107 | High | 8.4 | <1% | No |
| CVE-2026-26108 | High | 8.4 | <1% | No |
| CVE-2026-26109 | High | 8.4 | <1% | No |
| CVE-2026-26112 | High | 8.4 | <1% | No |
Affected products
Also released in March 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.