CVE-2026-77480: CWE-1220: Insufficient Granularity of Access Control in Microsoft Microsoft SQL Server 2017 (CU 31)
Description
Insufficient granularity of access control in SQL Server allows an authorized attacker to elevate privileges over a network.
CVSS v3.1
Score 8.8high
Affected software
Microsoft
Microsoft SQL Server 2017 (CU 31)
Microsoft
Microsoft SQL Server 2017 (GDR)
Microsoft
Microsoft SQL Server 2019 (CU 32)
Microsoft
Microsoft SQL Server 2019 (GDR)
Microsoft
Microsoft SQL Server 2022 (CU 26)
Microsoft
Microsoft SQL Server 2022 (GDR)
Microsoft
Microsoft SQL Server 2025 (CU8)
Microsoft
Microsoft SQL Server 2025 for x64-based Systems (GDR)
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, identified as CWE-1220, concerns insufficient granularity of access control in Microsoft SQL Server 2017 (CU 31) and later versions. It enables an attacker with some level of authorization to escalate privileges remotely over a network. The CVSS 3.1 base score is 8.8, indicating high severity, with attack vector network, low attack complexity, and no user interaction required. The vulnerability impacts confidentiality, integrity, and availability with high impact. Microsoft has published an official fix addressing this issue.
Potential Impact
An authorized attacker can exploit this vulnerability remotely to elevate privileges within the affected Microsoft SQL Server instances. This can lead to full compromise of the database server's confidentiality, integrity, and availability. There are no known exploits in the wild at this time.
Mitigation Recommendations
Microsoft has released an official fix for this vulnerability. Users should apply the security updates provided by Microsoft as detailed in the vendor advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77480. Since an official fix is available, applying the patch is the recommended mitigation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-08-20T20:11:33.672Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77480","vendor":"Microsoft"}]
Threat ID: 6aa04556acd9273b49fa9eb5
Added to database: 09/08/2026, 17:26:46 UTC
Last enriched: 10/14/2026, 21:55:45 UTC
Last updated: 10/22/2026, 13:15:23 UTC
Views: 35
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