Patch tracker / KB5002734

KB5002734: Office Online Server Security Update (July 2025)

KB5002734 is a Medium security update for Office Online Server, released 2025-07-08. It closes 1 CVE with a maximum CVSS of 5.5. It is the 25th largest of the 37 updates Microsoft shipped that month, by CVEs closed.

Update summary

Medium
2025-07-08
Released
1
CVEs fixed
5.5
Max CVSS v3
Medium
Severity
Deploy this cycle
Fixes 1 CVE for Office Online Server. No confirmed in-the-wild exploitation in this set today.

Fixes 1 CVE. Most severe CVSS 5.5 (Medium). EPSS exploit probability up to <1%. Among the lower half of tracked Microsoft updates by EPSS exploit probability.

Senserva found thiswe track every release for this product line, so we can tell you this package is behind

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.

Microsoft Update Catalog: download KB5002734Microsoft support article
Senserva AI Opinion for KB5002734

KB5002734 fixes CVE-2025-48812 alone, at Medium severity CVSS 5.5, for a narrower Office Online Server or Office 2019 build than the fuller KB5002740 and KB5002749 packages that also cover this CVE plus two more. This narrower package may leave CVE-2025-49711 and CVE-2025-49697 unaddressed on that same edition.

Do this: Confirm whether CVE-2025-49711 and CVE-2025-49697 also need the fuller KB5002740 or KB5002749 alongside this package.

AI-generated from public data, 2026-07-07. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5002734

Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.

Full tracking and change history for KB5002734

Released
2025-07-08
Last changed
2025-07-08
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 KB5002734 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.

CVESeverityCVSSEPSSExploited
CVE-2025-48812Medium5.5<1%No

Scope and sources

Affected products
Also released in July 2025

KB5002753

2 CVEs · Critical · exploited

KB5002754

2 CVEs · Critical · exploited

KB5002759

2 CVEs · Critical · exploited

KB5002760

2 CVEs · Critical · exploited

KB5002768

2 CVEs · Critical · exploited

KB5002741

4 CVEs · High · exploited

KB5002744

4 CVEs · High · exploited

KB5002751

2 CVEs · High · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5002734 page (Microsoft Support)Microsoft Update CatalogMicrosoft Security Update Guide

See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.

New to a term on this page? CVE, KB, KEV, CVSS, and EPSS are each explained once, on the Senserva security lexicon. Reference: Microsoft CVE and vulnerability management and the Microsoft patching guide.
Provided as is, without warranty; verify against the vendor advisory before acting. Data notice and terms.