CVE-2026-66309
CVE-2026-66309 is a critical-severity vulnerability in Microsoft Azure Sql Database with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-284.
Key facts
- Severity: Critical (CVSS 3.x base score 9.1)
- EPSS exploit prediction: 0% (40th percentile)
- Actively exploited: Not listed in CISA KEV
- Weakness: CWE-284
- Affected product: Microsoft Azure Sql Database
- Published:
- Last modified:
Description
Improper access control in Azure SQL Database allows an authorized attacker to elevate privileges over a network.
Frequently asked questions
- What is CVE-2026-66309?
- 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 a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2026-66309 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (40th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-66309?
- CVE-2026-66309 affects Microsoft Azure Sql Database. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-66309?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
- When was CVE-2026-66309 published?
- CVE-2026-66309 was published on 2026-08-20 and last updated on 2026-08-24.
References
Affected products (1)
- cpe:2.3:a:microsoft:azure_sql_database:-:*:*:*:*:*:*:*
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