CVE-2026-88102 Microsoft Failover Cluster Remote Code Execution Vulnerability
An unauthorized attacker can execute code over the network via a use-after-free flaw in Windows Failover Cluster.
- 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-2026-88102?
CVE-2026-88102 is a critical use after free vulnerability in Microsoft Windows Server 2019, published on 13 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Use after free in Windows Failover Cluster allows an unauthorized attacker to execute code over a network.
Weakness: CWE-416
Which versions are affected by CVE-2026-88102?
It affects 3 products.
Products include Microsoft Windows Server 2019, Microsoft Windows Server 2022, Microsoft Windows Server 2025.
How do I fix CVE-2026-88102?
No fix has been published for CVE-2026-88102 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2026-88102 being exploited?
There is no known exploitation of CVE-2026-88102 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Windows Server 2019
- CVE-2026-102192 Windows Failover Cluster Denial of Service Vulnerability
- CVE-2026-69577 Microsoft Azure Attestation service and Device Health Attestation Service Information Disclosure Vulnerability
- CVE-2026-96945 Windows Failover Cluster Denial of Service Vulnerability
- CVE-2026-21243 Windows Lightweight Directory Access Protocol (LDAP) Denial of Service Vulnerability
- CVE-2026-70005 Active Directory Federation Services (AD FS) Security Feature Bypass Vulnerability
Sources
Also known as GHSA-8vp3-xxj6-qx5c.