CVE-2025-26647 Windows Kerberos Elevation of Privilege Vulnerability

What is CVE-2025-26647?

CVE-2025-26647 is a high-severity vulnerability in Microsoft Windows Server 2008, published on 8 Apr 2025. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Improper input validation in Windows Kerberos allows an authorized attacker to elevate privileges over a network.

Weakness: CWE-20

Which versions are affected by CVE-2025-26647?

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-2025-26647?

No fix has been published for CVE-2025-26647 yet. Limit exposure of the affected software until one is available.

Is CVE-2025-26647 being exploited?

There is no known exploitation of CVE-2025-26647 in the wild and no public exploit code.

Other vulnerabilities in Microsoft Windows Server 2008

• CVE-2020-1350 Microsoft Windows DNS Server Remote Code Execution Exploited Critical 10.0
• CVE-2020-1040 Microsoft Hyper-V RemoteFX vGPU Remote Code Execution Exploited Critical 9.0
• CVE-2011-1966 Memory corruption in n/a Critical 10.0
• CVE-2010-0239 Memory corruption in n/a Critical 10.0
• CVE-2010-0240 Code injection in n/a Critical 10.0

All Microsoft Windows Server 2008 vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-c4pv-p44r-9xfc.