CVE-2026-77483 Microsoft SQL Server - Authentication Bypass

Microsoft SQL Server contains a broken authentication vulnerability caused by weak authentication mechanisms, letting authorized attackers elevate privileges over a network, exploit requires valid credentials.

CVSS base score 8.8 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Required
EPSS
0.78% chance of exploitation in 30 days
View the NVD record ↗

Details

Type
Authentication Bypass
Impact
Privilege Escalation
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
8 September 2026
Updated
15 October 2026
Weakness
CWE-1390

Vendor fix

Update to the latest version of Microsoft SQL Server.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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