Patch tracker / KB5002758

KB5002758: Office Online Server Security Update (August 2025)

KB5002758 is a High security update for Office Online Server, released 2025-08-12. It closes 4 CVEs with a maximum CVSS of 7.8. It is the 43rd largest of the 67 updates Microsoft shipped that month, by CVEs closed.

Update summary

High
2025-08-12
Released
4
CVEs fixed
7.8
Max CVSS v3
High
Severity
Deploy this cycle
Fixes 4 CVEs for Office Online Server. No confirmed in-the-wild exploitation in this set today.

Fixes 4 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.

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 KB5002758Microsoft support article
Senserva AI Opinion for KB5002758

KB5002758 is an August 12, 2025 Office update that patches four CVEs across Office 2019 (32-bit and 64-bit) and Office Online Server, with the most serious rated High at CVSS 7.8. Anyone running these Office builds is exposed, and the inclusion of Office Online Server means server-side rendering deployments need attention beyond just desktop clients. None of the four CVEs are in the CISA KEV catalog and EPSS peaks at only 1 percent, so this is a maintenance-window fix rather than an emergency.

Do this: Schedule KB5002758 across your Office 2019 clients and any Office Online Server hosts in this month's patch cycle.

AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.

Senserva AI Opinion and rich prompt for KB5002758

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

Full tracking and change history for KB5002758

Released
2025-08-12
Last changed
2025-08-12
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 KB5002758 is installed

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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-2025-53735High7.8<1%No
CVE-2025-53737High7.8<1%No
CVE-2025-53739High7.8<1%No
CVE-2025-53741High7.8<1%No

Scope and sources

Affected products
Also released in August 2025

KB5058379

36 CVEs · High · exploited

KB5058383

39 CVEs · High · exploited

KB5058384

44 CVEs · High · exploited

KB5058385

42 CVEs · High · exploited

KB5058387

33 CVEs · High · exploited

KB5058392

42 CVEs · High · exploited

KB5058405

38 CVEs · High · exploited

KB5058411

44 CVEs · High · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5002758 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.