Patch tracker / KB5002875

KB5002875: Office Online Server Security Update (June 2026)

KB5002875 is a High security update for Office Online Server, released 2026-06-09. It closes 7 CVEs with a maximum CVSS of 8.2. It is the 11th largest of the 18 updates Microsoft shipped that month, by CVEs closed.

Update summary

High
2026-06-09
Released
7
CVEs fixed
8.2
Max CVSS
High
Severity
Deploy this cycle
Fixes 7 CVEs for Office Online Server. No confirmed in-the-wild exploitation in this set today.

Fixes 7 CVEs. Most severe CVSS 8.2 (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 Microsoft Office 365 for Mac 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.

Senserva found thisno known issues as of our last check

We checked Microsoft's support article for KB5002875 on 2026-08-12 and it lists no known issues. Read the article before broad deployment; Microsoft adds issues as reports come in, and we re-check on every refresh.

Microsoft Update Catalog: download KB5002875Microsoft support article
Senserva AI Opinion for KB5002875

KB5002875 patches 7 CVEs across an unusual mix of Office surfaces: Office 365 for Mac, Office Online Server, and Office 2019 32-bit, meaning both endpoint and server-side installs need attention. The top issue reaches High severity at CVSS 8.2, but exploitation signals are low with 1% EPSS, no CISA KEV listing, and no ransomware linkage. This is a routine but broad Office rollup rather than an emergency.

Do this: Schedule this update across your Mac Office, Office Online Server, and 32-bit Office 2019 2019 fleets, prioritizing the internet-facing Office Online Server instances first.

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

Senserva AI Opinion and rich prompt for KB5002875

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

Full tracking and change history for KB5002875

Released
2026-06-09
Last changed
2026-06-09
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 KB5002875 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-2026-44822High8.2<1%No
CVE-2026-45455High8.2<1%No
CVE-2026-44817High7.8<1%No
CVE-2026-44820High7.8<1%No
CVE-2026-44823High7.8<1%No
CVE-2026-45469High7.8<1%No
CVE-2026-44818High7.0<1%No

Scope and sources

Affected products
Also released in June 2026

KB5087423

66 CVEs · Critical

KB5087539

66 CVEs · Critical

KB5089466

61 CVEs · Critical

KB5089549

61 CVEs · Critical

KB5093998

158 CVEs · Critical

KB5094126

107 CVEs · Critical

KB5094128

105 CVEs · Critical

KB5002876

8 CVEs · High

The full month, summarized: Microsoft Patch Tuesday.

Authoritative references
Official KB5002875 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.