CVE-2026-77483

Analyzed Analyzed - Analysis Complete

Authentication Bypass in SQL Server

Publication date: 2026-09-08

Last updated on: 2026-09-15

Assigner: Microsoft Corporation

Description

Weak authentication in SQL Server allows an authorized attacker to elevate privileges over a network.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-09-08

Last Modified

2026-09-15

Generated

2026-09-29

AI Q&A

2026-09-09

EPSS Evaluated

2026-09-27

NVD

CVE-2026-77483

Affected Vendors & Products

Vendor	Product	Version / Range
microsoft	sql_server_2022	to 16.0.1200.5 (exc)
microsoft	sql_server_2022	From 16.0.4003.1 (inc) to 16.0.4275.2 (exc)
microsoft	sql_server_2017	to 14.0.2130.4 (exc)
microsoft	sql_server_2017	From 14.0.3006.16 (inc) to 14.0.3550.4 (exc)
microsoft	sql_server_2019	to 15.0.2190.7 (exc)
microsoft	sql_server_2019	From 15.0.4003.23 (inc) to 15.0.4490.9 (exc)
microsoft	sql_server_2025	to 17.0.1135.8 (exc)
microsoft	sql_server_2025	From 17.0.4006.2 (inc) to 17.0.4085.5 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-1390	The product uses an authentication mechanism to restrict access to specific users or identities, but the mechanism does not sufficiently prove that the claimed identity is correct.

Attack-Flow Graph

Executive Summary

This vulnerability involves weak authentication in SQL Server that allows an authorized attacker to escalate their privileges over a network. This means an attacker with some access could gain higher-level permissions without proper authorization.

Impact Analysis

An attacker could exploit this to gain unauthorized access to sensitive data, modify or delete database contents, or execute administrative commands. This could lead to data breaches, system compromise, or disruption of services.

Compliance Impact

This vulnerability could lead to unauthorized access or exposure of sensitive data, which may violate compliance requirements under GDPR, HIPAA, or other regulations. Organizations may face penalties or legal consequences if such breaches occur due to inadequate security measures.

Mitigation Strategies

Apply the latest security updates from Microsoft for SQL Server to address weak authentication issues. Monitor Microsoft's update guide for patches and verify installation on all affected systems.

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