CVE-2026-77483: CWE-1390: Weak Authentication in Microsoft Microsoft SQL Server 2017 (CU 31)
Description
Weak authentication 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)
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-77483) in Microsoft SQL Server 2017 (CU 31) and related versions is classified under CWE-1390 (Weak Authentication). It enables an attacker with existing authorized access to escalate privileges remotely over the network. The CVSS 3.1 base score is 8.8, indicating high severity, with impacts on confidentiality, integrity, and availability. Microsoft has published an official fix addressing this issue.
Potential Impact
An authorized attacker exploiting this vulnerability can elevate their privileges on the affected SQL Server instances, potentially gaining higher-level access than intended. This can lead to full compromise of the database server, including unauthorized data access, modification, or disruption of service.
Mitigation Recommendations
An official fix is available from Microsoft. Users should apply the security updates provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-77483 to remediate this vulnerability.
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-2026-77483","vendor":"Microsoft"}]
Threat ID: 6aa04556acd9273b49fa9ebb
Added to database: 09/08/2026, 17:26:46 UTC
Last enriched: 10/14/2026, 21:55:56 UTC
Last updated: 10/23/2026, 15:10:15 UTC
Views: 44
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