Patch tracker / KB5002703

KB5002703: Office Online Server Security Update (April 2025)

KB5002703 is a High security update for Office Online Server, released 2025-04-08. It closes 1 CVE 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

High
2025-04-08
Released
1
CVEs fixed
7.8
Max CVSS v3
High
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 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 KB5002703Microsoft support article
Senserva AI Opinion for KB5002703

This is one of three parallel packages fixing the same CVE-2025-26642 across Office Online Server, SharePoint Server 2019, and Office 2019, High severity, CVSS 7.8. Confirm which edition or language pack KB5002703 targets before assuming full coverage across a mixed SharePoint/Office environment. No KEV or ransomware association applies to this CVE.

Do this: Confirm the matching edition and apply KB5002703 where it fits.

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

Senserva AI Opinion and rich prompt for KB5002703

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

Full tracking and change history for KB5002703

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 KB5002703 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-2025-26642High7.822%No

Scope and sources

Affected products
Also released in April 2025

KB5055518

59 CVEs · High · exploited

KB5055519

73 CVEs · High · exploited

KB5055521

60 CVEs · High · exploited

KB5055523

82 CVEs · High · exploited

KB5055526

77 CVEs · High · exploited

KB5055527

73 CVEs · High · exploited

KB5055528

65 CVEs · High · exploited

KB5055547

43 CVEs · High · exploited

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5002703 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.