CVE-2026-50647 Active Directory Federation Server Denial of Service Vulnerability
An unauthorized attacker can cause a denial of service in Active Directory Federation Services via an infinite loop vulnerability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-50647?
CVE-2026-50647 is a high-severity denial of service vulnerability in Microsoft .Net Framework, published on 14 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Loop with unreachable exit condition ('infinite loop') in Active Directory Federation Services (AD FS) allows an unauthorized attacker to deny service over a network.
Weakness: CWE-835
Which versions are affected by CVE-2026-50647?
It affects 13 products.
Products include Microsoft .Net Framework, Microsoft Windows 10 1607, Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 24h2 and 7 more.
How do I fix CVE-2026-50647?
No fix has been published for CVE-2026-50647 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-50647 being exploited?
There is no known exploitation of CVE-2026-50647 in the wild and no public exploit code.
Other vulnerabilities in Microsoft .Net Framework
Sources
Also known as GHSA-wcpq-cwvv-7pj4.