MSRC-CVE-2026-70019 — Windows Compressed Folder Information Disclosure Vulnerability

Summary

Impact: Information Disclosure. Microsoft rating: Important. Not known to be exploited — Exploitation Less Likely. Customer action: Required.

Details

What type of information could be disclosed by this vulnerability?
The type of information that could be disclosed if an attacker successfully exploited this vulnerability is unauthorized file system access - reading from the file system.

Security updates
10.0.26100.33438 — https://support.microsoft.com/help/5122871
10.0.26200.9445 — https://support.microsoft.com/help/5124008
10.0.22631.7582 — https://support.microsoft.com/help/5122880
10.0.28000.2954 — https://support.microsoft.com/help/5124012

Vulnerabilities 1

Medium 6.5

CVE-2026-70019

Windows Compressed Folder Information Disclosure Vulnerability

Windows hard link in Windows Compressed Folder allows an unauthorized attacker to disclose information over a network.

Microsoft Windows Server 2025 Windows Server 2025 (Server Core installation) Windows 11 Version 24H2 Windows

Sep 8, 2026

Revision history

2026-09-08 #1
Information published.

References

CVE-2026-70019 Windows Compressed Folder Information Disclosure Vulnerability - HTML
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-70019
Microsoft Exploitability Index
https://www.microsoft.com/en-us/msrc/exploitability-index?rtc=1
Microsoft Support Lifecycle
https://support.microsoft.com/lifecycle
Common Vulnerability Scoring System
https://www.first.org/cvss