CVE-2026-20833 Windows Kerberos Information Disclosure Vulnerability
An authorized local attacker can exploit weak Kerberos cryptography to disclose sensitive information on Windows Server systems.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-20833?
CVE-2026-20833 is a medium-severity vulnerability in Microsoft Windows Server 2008, published on 13 Jan 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Use of a broken or risky cryptographic algorithm in Windows Kerberos allows an authorized attacker to disclose information locally.
Weakness: CWE-327
Which versions are affected by CVE-2026-20833?
It affects 7 products.
Products include Microsoft Windows Server 2008, Microsoft Windows Server 2012, Microsoft Windows Server 2016, Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2022 23h2 and 1 more.
How do I fix CVE-2026-20833?
No fix has been published for CVE-2026-20833 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-20833 being exploited?
There is no known exploitation of CVE-2026-20833 in the wild and no public exploit code.
Public exploit code: 2 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Windows Server 2008
Sources
Also known as GHSA-qvf8-2q87-3fcr.