Patch tracker / KB5002778
KB5002778: Microsoft SharePoint Server 2019 Security Update (September 2025)
KB5002778 is a High security update for Microsoft SharePoint Server 2019, released 2025-09-09. It closes 3 CVEs with a maximum CVSS of 8.8. The most likely of them to be attacked is CVE-2025-54897, which FIRST.org rates at 19% probability of exploitation in the next 30 days.
Update summary
Fixes 3 CVEs. Most severe CVSS 8.8 (High). EPSS exploit probability up to 19%. 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.
KB5002778 is a September 2025 SharePoint on-premises update covering Enterprise Server 2016, Server 2019, and the Subscription Edition, fixing three CVEs including one rated High at CVSS 8.8. The highest EPSS is 18 percent, none are in the CISA KEV catalog, and none are ransomware-linked, so this is a patch-on-schedule item rather than a fire drill. That said, SharePoint has become a repeated target for post-exploitation on internet-facing farms, so the three-way version coverage means most on-prem estates need attention here.
Do this: Schedule this update across your SharePoint 2016, 2019, and Subscription Edition farms, applying it to internet-facing servers first.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5002778
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5002778
- Released
- 2025-09-09
- Last changed
- 2026-08-10
- Changes tracked
- 4
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 KB5002778 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-2025-54897 | High | 8.8 | 19% | No |
| CVE-2025-54906 | High | 7.8 | 19% | No |
| CVE-2025-54905 | High | 7.1 | 19% | No |
Scope and sources
- Affected products
- Also released in September 2025
KB5002775
3 CVEs · HighKB5002784
1 CVE · HighKB5065220
2 CVEs · HighKB5065221
2 CVEs · HighKB5065222
3 CVEs · HighKB5065223
3 CVEs · HighKB5065224
3 CVEs · HighKB5065225
3 CVEs · HighThe full month, summarized: Microsoft Patch Tuesday.
- Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.