CVE-2026-66816
Microsoft SQL Server Security Feature Bypass Vulnerability
Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- None
- Availability
- None
Exploit likelihood
What each source reports
CVE List Score used
Microsoft SQL Server Security Feature Bypass Vulnerability
Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.
- Record
CVE-2026-66816- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Weakness
- CWE-778
- Updated
- 2026-11-02
EUVDEUVD-2026-73376
Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.
- Record
EUVD-2026-73376- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-c9p4-3ww6-v9gp
Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature...
Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.
- Record
GHSA-c9p4-3ww6-v9gp- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-778
- Updated
- 2026-11-02
NVD
Insufficient logging in SQL Server allows an authorized attacker to bypass a security feature over a network.
- Record
CVE-2026-66816- CVSS 3.1
- 6.5 Medium
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N - Weakness
- CWE-778
- 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-2026-66816 is a medium vulnerability (CVSS 6.5) in Microsoft Sql Server 2022 (cu 26), published September 8, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.00%, the 62nd percentile. No source names a fixed version.