Patch tracker / KB5002834
KB5002834: Microsoft SharePoint Server 2019 Security Update (February 2026)
KB5002834 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.
KB5002834 patches two CVEs across on-premises SharePoint Enterprise Server 2016, SharePoint Server 2019, and Office 2019 32-bit, with a top rating of High (CVSS 7.5). The overlap of SharePoint and Office 2019 in one update points to a shared component, so organizations running either product family need it. Neither CVE-2026-21260 nor CVE-2026-21511 is in CISA KEV or tied to ransomware, and EPSS peaks at 4 percent, so exploitation pressure is currently low.
Do this: Schedule this update in your next patch window for all SharePoint 2016/2019 farm servers and Office 2019 32-bit installs, prioritizing internet-facing SharePoint front ends.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5002834
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5002834
- 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 KB5002834 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.