CVE-2026-88099
Windows Failover Cluster Denial of Service Vulnerability
Uncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- High
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows Failover Cluster Denial of Service Vulnerability
Uncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.
- Record
CVE-2026-88099- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C - Weakness
- CWE-248
- Updated
- 2026-11-02
EUVDEUVD-2026-99651
Uncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.
- Record
EUVD-2026-99651- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-hh53-6rv7-rjrv
Uncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service...
Uncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.
- Record
GHSA-hh53-6rv7-rjrv- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-248
- Updated
- 2026-11-02
NVD
Uncaught exception in Windows Failover Cluster allows an unauthorized attacker to deny service over a network.
- Record
CVE-2026-88099- CVSS 3.1
- 5.9 Medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-248
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-88099 is a medium vulnerability (CVSS 5.9) in Microsoft Windows Server 2019, published October 13, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.82%, the 57th percentile. No source names a fixed version.