Patch tracker / KB5050674
KB5050674: Microsoft Exchange Server Subscription Security Update (August 2025)
KB5050674 is a High security update for Microsoft Exchange Server Subscription, released 2025-08-12. It closes 1 CVE with a maximum CVSS of 8.0. Get it from the Microsoft Update Catalog below, and see where it sits against the rest of the month on the patch tracker.
Update summary
New to these terms? How the Microsoft patching tools fit together, this month's Patch Tuesday summary, and every update ranked by real-world risk.
Senserva AI Opinion for KB5050674
KB5050674 addresses CVE-2025-53786, a High severity (CVSS 8.0) flaw affecting on-premises Exchange Server Subscription Edition RTM, Exchange 2019 CU15, and Exchange 2016 CU23. This targets hybrid Exchange deployments where the on-prem and Exchange Online trust relationship can be abused to escalate privileges into the connected cloud tenant. It is not in CISA KEV and has a modest 7% EPSS, but the hybrid attack path makes it consequential for organizations still running coexistence with Exchange Online.
Do this: Apply KB5050674 to your on-premises Exchange servers and follow Microsoft's hybrid hardening guidance to rotate or reset the shared service principal keys after patching.
AI-generated from public data, 2026-07-21. Verify against the vendor advisory before acting.
Senserva AI Opinion and rich prompt for KB5050674
Copy this prompt into Claude, ChatGPT, or Copilot. The facts are included, sourced from this page.
Full tracking and change history for KB5050674
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.
Exploitation and severity
Fixes 1 CVE. Most severe CVSS 8.0 (High). EPSS exploit probability up to 7.4%.
Among the top half of tracked Microsoft updates by EPSS exploit probability.
What to do
Moderate priority: schedule it in your normal patch cycle. Senserva flags whether KB5050674 is missing on your devices.
Check if KB5050674 is installed
Copy-paste PowerShell: one machine, or your whole estate in one pass. No output means the update is not installed.
Get-HotFix covers Windows updates. Office, SharePoint, and Exchange server updates show under installed updates in Programs and Features, or check the Update Catalog history.
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.
| CVE | Severity | CVSS | EPSS | Exploited |
|---|---|---|---|---|
| CVE-2025-53786 | High | 8.0 | 7.4% | No |
Affected products
Also released in August 2025
The highest-risk updates from the same release:
The full month, summarized: Microsoft Patch Tuesday.
Authoritative references
See this and every Microsoft update ranked by real-world risk on the Microsoft Patch Tracker.