Patch tracker / KB5002839
KB5002839: Microsoft SharePoint Server 2019 Security Update (February 2026)
KB5002839 is a High security update for Microsoft SharePoint Server 2019, released 2026-02-10. It closes 2 CVEs with a maximum CVSS of 7.5. 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 KB5002839
KB5002839 patches two vulnerabilities (CVE-2026-21260 and CVE-2026-21511) spanning SharePoint Enterprise Server 2016, SharePoint Server 2019, and Office 2019 for 32-bit editions, with a top rating of High Severity at CVSS 7.5. Neither CVE is in the CISA KEV catalog and the highest EPSS is only 4 percent, so active exploitation is not currently indicated. The unusual part is the mixed scope: this single KB touches both server-side SharePoint farms and a client Office 2019 install, so patching may involve two different teams and deployment channels.
Do this: Confirm which of your environments run SharePoint 2016, SharePoint 2019, or 32-bit Office 2019 and schedule KB5002839 through the appropriate server and client update paths.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5002839
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5002839
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 2 CVEs. Most severe CVSS 7.5 (High). EPSS exploit probability up to 3.6%.
Among the top half of tracked Microsoft updates by EPSS exploit probability.
What to do
Moderate priority: schedule it in your normal patch cycle. Senserva flags whether KB5002839 is missing on your devices.
Check if KB5002839 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-2026-21260 | High | 7.5 | 3.6% | No |
| CVE-2026-21511 | High | 7.5 | 3.6% | No |
Affected products
Also released in February 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.