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The Update Bureau
Office Online Server OOS Office Online Server Security update
Patch Tuesday

KB5002740

KB5002740: Cumulative update for Office Online Server, version OOS, July 2025. Closes Excel and Office code-execution flaws

In short

The update resolves three vulnerabilities, including a Critical Microsoft Office remote code execution flaw and vulnerabilities in Excel.

Does it affect you? Applies to: Computers running the release version of Office Online Server (x64). The release version must already be installed.

Build
16.0.10417.20027
Security
3 fixed · 1 critical
Restart
Required

What changes

Fixes 3 changes

Excel

Verified in package 2 items

For: Office Online Server administrators

  • An Excel remote code execution vulnerability is resolved.1
  • An Excel information disclosure vulnerability is resolved.1

Office

For: Office Online Server administrators

  • A Microsoft Office remote code execution vulnerability is resolved.1

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2025-07-08
Classification
Security Updates
Type
Cumulative update
Restart
Required
Replaces
KB5002728, KB5002707, KB5002699, KB5002690
+5 earlier KB5002679, KB5002677, KB5002648, KB5002601, KB5002503
Replaced by
KB5002752
VersionBuildChannel
OOS 16.0.10417.20027 General availability

Security

3 vulnerabilities fixed
1 critical 2 important
VulnerabilitySeverityCVSS
CVE-2025-49697
Microsoft Office Remote Code Execution Vulnerability
 Critical 8.4
CVE-2025-49711
Microsoft Excel Remote Code Execution Vulnerability
 Important 7.8
CVE-2025-48812
Microsoft Excel Information Disclosure Vulnerability
 Important 5.5

Downloads (Microsoft Update Catalog)

Package OOS
1.0 GB
wacserver-x-none.cab Main update · KB5002740 SHA-1: 69a8490f…e877fd

Updated components

1,591 files changed since the previous update for the same versions.

Top changed componentsFiles
Office web apps369
PowerPoint322
Excel260
Document conversion74
Word50

Verified in package: changed files confirm Excel.

Sources

Updated
Cited passages from Microsoft's official notes (1)
  1. 1. This security update resolves a Microsoft Excel remote code execution vulnerability, Microsoft Excel information disclosure vulnerability, and Microsoft Office remote code execution vulnerability. support.microsoft.com
Checked automatically: 7 of 8 checks passed, 1 quoted passage · compared with Microsoft's page on Oct 20, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: not passed

A second AI read the text against the sources: correctness 5/5, clarity 5/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake