Patch tracker / KB5094139

KB5094139

Microsoft security update released 2026-06-09. Fixes 8 CVEs.

HighCISA KEV

Download KB5094139

Get the official update for KB5094139. The download and file size for each supported product are on the Microsoft Update Catalog page.

Microsoft Update Catalog: download KB5094139Microsoft support article

Update summary

Released
2026-06-09
CVEs fixed
8
Max CVSS
8.8
Severity
High

Exploitation and severity

Fixes 8 CVEs. At least one is actively exploited (CISA KEV). Most severe CVSS 8.8 (High). EPSS exploit probability up to 5.6%.

Among the top half of tracked Microsoft updates by EPSS exploit probability.

What to do

Treat as urgent: it is being exploited in the wild (CISA KEV), so patch ahead of items that are not. Senserva flags whether KB5094139 is missing on your devices.

CVEs fixed by this update

CVE-2026-42897CVE-2026-45500CVE-2026-45501CVE-2026-45502CVE-2026-45503CVE-2026-45504CVE-2026-45583CVE-2026-47631

Affected products

  • Microsoft Exchange Server 2019 Cumulative Update 14
  • Microsoft Exchange Server 2019 Cumulative Update 15
  • Microsoft Exchange Server Subscription Edition RTM

References

Microsoft support articleMicrosoft Security Update Guide

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

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Lexicon: the terms on this page
CVE
Common Vulnerabilities and Exposures. A unique ID for one publicly known vulnerability, such as CVE-2025-1234.
KB
Microsoft Knowledge Base article. The identifier for a specific Microsoft update.
KEV
CISA Known Exploited Vulnerabilities. CVEs confirmed exploited in the wild. Fix these first.
CVSS
Common Vulnerability Scoring System. A standardized Severity score from 0 to 10.
EPSS
Exploit Prediction Scoring System. The probability a CVE will be exploited in the next 30 days.
MSRC
Microsoft Security Response Center. Microsoft's Patch Tuesday advisories and KB-to-CVE mapping.
NVD
National Vulnerability Database (NIST). Authoritative CVE metadata and CVSS scores.
Ransomware
The vulnerability is linked to known ransomware activity.