CVE-2026-66816 Microsoft SQL Server Security Feature Bypass Vulnerability
An authorized attacker can bypass security features in Microsoft SQL Server due to insufficient logging mechanisms.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66816?
CVE-2026-66816 is a medium-severity vulnerability in Microsoft Sql Server 2022, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.
Weakness: CWE-778
Which versions are affected by CVE-2026-66816?
It affects 2 products.
Products include Microsoft Sql Server 2022, Microsoft Sql Server 2025.
How do I fix CVE-2026-66816?
No fix has been published for CVE-2026-66816 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-66816 being exploited?
There is no known exploitation of CVE-2026-66816 in the wild and no public exploit code.
Other vulnerabilities in Microsoft Sql Server 2022
- CVE-2026-67643 Microsoft SQL Server Remote Code Execution Vulnerability
- CVE-2026-78456 SQL Server Remote Code Execution Vulnerability
- CVE-2025-47954 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-20803 Microsoft SQL Server Elevation of Privilege Vulnerability
- CVE-2026-67389 Microsoft SQL Server Information Disclosure Vulnerability
Sources
Also known as GHSA-c9p4-3ww6-v9gp.