Patch tracker / KB5002699
KB5002699: Office Online Server Security Update (April 2025)
KB5002699 is a High security update for Office Online Server, released 2025-04-08. It closes 3 CVEs with a maximum CVSS of 7.8. The most likely of them to be attacked is CVE-2025-26642, which FIRST.org rates at 22% probability of exploitation in the next 30 days.
Update summary
Fixes 3 CVEs. Most severe CVSS 7.8 (High). EPSS exploit probability up to 2.4%. Among the top 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.
Three CVEs are fixed in this April update for Office Online Server and Office 2019, the highest reaching Severity High at CVSS 7.8. Office Online Server exposure matters especially where documents are rendered server-side for browser access, adding a server-side attack surface beyond typical desktop Office risk. Patch both the server role and any remaining Office 2019 desktop installs together.
Do this: Update Office Online Server and Office 2019 installations together to close all three April CVEs.
AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5002699
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5002699
- Released
- 2025-04-08
- Last changed
- 2025-04-08
- 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 KB5002699 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-2025-26642 | High | 7.8 | 22% | No |
| CVE-2025-27746 | High | 7.8 | 2.4% | No |
| CVE-2025-27751 | High | 7.8 | 2.4% | No |
Scope and sources
- Affected products
- Also released in April 2025
KB5055518
59 CVEs · High · exploitedKB5055519
73 CVEs · High · exploitedKB5055521
60 CVEs · High · exploitedKB5055523
82 CVEs · High · exploitedKB5055526
77 CVEs · High · exploitedKB5055527
73 CVEs · High · exploitedKB5055528
65 CVEs · High · exploitedKB5055547
43 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.