Patch tracker / KB5078738

KB5078738

Microsoft security update released 2026-03-10. Fixes 1 CVE.

High

Download KB5078738

Get the official update for KB5078738. The download and file size for each supported product are on the Microsoft Update Catalog page.

Microsoft Update Catalog: download KB5078738 Microsoft support article

Update summary

Released

2026-03-10

CVEs fixed

1

Max CVSS

7.5

Severity

High

Exploitation and severity

Fixes 1 CVE. Most severe CVSS 7.5 (High). EPSS exploit probability up to 1.2%.

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

What to do

Moderate priority: schedule it in your normal patch cycle. Senserva flags whether KB5078738 is missing on your devices.

CVEs fixed by this update

Affected products

Windows 11 Version 26H1 for ARM64-based Systems
Windows 11 version 26H1 for x64-based Systems
Windows Server 2019 (Server Core installation)

References

Microsoft support article Microsoft 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.