Patch tracker / KB5087471

KB5087471

Microsoft security update released 2026-05-12. Fixes 42 CVEs.

Critical

Download KB5087471

Get the official update for KB5087471. The download and file size for each supported product are on the Microsoft Update Catalog page.

Microsoft Update Catalog: download KB5087471 Microsoft support article

Update summary

Released

2026-05-12

CVEs fixed

42

Max CVSS

9.8

Severity

Critical

Exploitation and severity

Fixes 42 CVEs. Most severe CVSS 9.8 (Critical). EPSS exploit probability up to 72%.

Among the top 25% of tracked Microsoft updates by EPSS exploit probability.

What to do

High priority: EPSS puts the odds of near-term exploitation high. Senserva flags whether KB5087471 is missing on your devices.

Affected products

Windows 10 Version 1809 for 32-bit Systems
Windows 10 Version 1809 for x64-based Systems
Windows Server 2019

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.