Patch tracker / KB5002794
KB5002794: Office Online Server Security Update (October 2025)
KB5002794 is a High security update for Office Online Server, released 2025-10-14. It closes 7 CVEs with a maximum CVSS of 7.8. It is the 16th largest of the 60 updates Microsoft shipped that month, by CVEs closed.
Update summary
Fixes 7 CVEs. Most severe CVSS 7.8 (High). EPSS exploit probability up to <1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.
A newer security update for Office Online Server has shipped since this one: KB5002884 (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.
KB5002794 is the October 14, 2025 Office update covering seven CVEs across Office 2019 (32-bit and 64-bit) and Office Online Server. The top issue rates High at CVSS 7.8, and notably this bundle patches the server-side Office Online Server alongside the desktop editions, so both endpoint and server admins are in scope. None of the seven CVEs are on the CISA KEV list and EPSS peaks at just 1 percent, so this is a scheduled hygiene patch rather than an emergency.
Do this: Deploy KB5002794 to Office 2019 clients and your Office Online Server hosts during your normal October patch window.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5002794
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5002794
- Released
- 2025-10-14
- Last changed
- 2025-10-14
- Changes tracked
- 1
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 KB5002794 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-2025-59223 | High | 7.8 | <1% | No |
| CVE-2025-59224 | High | 7.8 | <1% | No |
| CVE-2025-59225 | High | 7.8 | <1% | No |
| CVE-2025-59231 | High | 7.8 | <1% | No |
| CVE-2025-59233 | High | 7.8 | <1% | No |
| CVE-2025-59232 | High | 7.1 | 2.3% | No |
| CVE-2025-59235 | High | 7.1 | 2.3% | No |
Scope and sources
- Affected products
- Also released in October 2025
KB5070879
1 CVE · Critical · exploitedKB5070881
1 CVE · Critical · exploitedKB5070882
1 CVE · Critical · exploitedKB5070883
1 CVE · Critical · exploitedKB5070884
1 CVE · Critical · exploitedKB5070886
1 CVE · Critical · exploitedKB5070887
1 CVE · Critical · exploitedKB5070892
1 CVE · Critical · 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.