CVE-2026-20872 NTLM Hash Disclosure Spoofing Vulnerability
An attacker can exploit external control of file paths in Windows NTLM to disclose hashes and perform network spoofing.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2026-20872?
CVE-2026-20872 is a medium-severity vulnerability in Microsoft Windows 10 1607, published on 13 Jan 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Official description
External control of file name or path in Windows NTLM allows an unauthorized attacker to perform spoofing over a network.
Weakness: CWE-73
Which versions are affected by CVE-2026-20872?
It affects 14 products.
Products include Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2 and 8 more.
How do I fix CVE-2026-20872?
No fix has been published for CVE-2026-20872 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20872 being exploited?
There is no known exploitation of CVE-2026-20872 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows 10 1607
- CVE-2026-33824 Microsoft Internet Key Exchange (IKE) Service Extensions Double Free
- CVE-2026-21510 Microsoft Windows Shell Protection Mechanism Failure
- CVE-2026-21513 Microsoft MSHTML Framework Protection Mechanism Failure
- CVE-2023-32049 Microsoft Windows Defender SmartScreen Security Feature Bypass
- CVE-2023-29360 Microsoft Streaming Service Untrusted Pointer Dereference
Sources
Also known as GHSA-fpp4-775q-mqrm.