Microsoft.Data.SqlClient Information Disclosure Vulnerability

Summary

Authentication bypass by capture-replay in SQL Server allows an unauthorized attacker to disclose information over a network.

Products covered

• Microsoft.Data.SqlClient 6.1

• Microsoft.Data.SqlClient 7.0

• Microsoft.Data.SqlClient 7.1

Remediation

Release Notes

Vendor-listed fixes

• 6.1.7

• 7.0.3

• 7.1.0-preview3

CVEs in this advisory 1

CVE-2026-62903

Updates

1. Nov 10, 2026 at 8:00 AM UTC
   Published by Microsoft Security Response Center

   The publication date reported by the vendor.

2. Nov 10, 2026 at 8:15 PM UTC
   Added to SecurityAlert

   We collected the advisory from the official source.