CVE-2026-69591 Windows NTFS Information Disclosure Vulnerability
An out-of-bounds read in the Windows NTFS driver allows an authorized attacker to disclose sensitive information over a network.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-69591?
CVE-2026-69591 is a medium-severity vulnerability in Microsoft Windows 10 1809, published on 8 Sep 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Out-of-bounds read in Windows NTFS allows an authorized attacker to disclose information over a network.
Weakness: CWE-125
Which versions are affected by CVE-2026-69591?
It affects 10 products.
Products include Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2 and 4 more.
How do I fix CVE-2026-69591?
No fix has been published for CVE-2026-69591 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-69591 being exploited?
There is no known exploitation of CVE-2026-69591 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1809
- CVE-2024-29988 Microsoft SmartScreen Prompt Security Feature Bypass
- CVE-2024-21412 Microsoft Windows Internet Shortcut Files Security Feature Bypass
- CVE-2025-62221 Microsoft Windows Use After Free
- CVE-2025-30400 Microsoft Windows DWM Core Library Use-After-Free
- CVE-2024-21338 Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control
Sources
Also known as GHSA-9h44-2fpp-gm5f.