CVE-2026-66309 — CRITICAL (9.1)

Vulnerability Description

Improper access control in Azure SQL Database allows an authorized attacker to elevate privileges over a network.

CVSS Score

9.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-284

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-66309

FAQ

What is CVE-2026-66309?

CVE-2026-66309 is a vulnerability with a CVSS score of 9.1 (CRITICAL). Improper access control in Azure SQL Database allows an authorized attacker to elevate privileges over a network.

How severe is CVE-2026-66309?

CVE-2026-66309 has been rated CRITICAL with a CVSS base score of 9.1/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-66309?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.