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. It is the 17th largest of the 31 updates Microsoft shipped that month, by CVEs closed.
Update summary
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.
A newer security update for Microsoft SharePoint Enterprise Server 2016 has shipped since this one: KB5002882 (2026-08-11). For cumulative update families the newer package includes these fixes, so installing that one is usually the shorter path. Verify against your own update rings before you skip this package.
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
- Released
- 2026-02-10
- Last changed
- 2026-07-29
- Changes tracked
- 3
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 KB5002839 is installed
Elevated PowerShell. No output means it is not installed.
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 |
Scope and sources
- Affected products
- Also released in February 2026
KB5075897
29 CVEs · High · exploitedKB5075899
29 CVEs · High · exploitedKB5075904
24 CVEs · High · exploitedKB5075906
27 CVEs · High · exploitedKB5075912
24 CVEs · High · exploitedKB5075941
26 CVEs · High · exploitedKB5075942
29 CVEs · High · exploitedKB5075943
27 CVEs · High · exploitedThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.