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SQL Server 2025 GDR SQL Server 2025 GDR Security update
Patch Tuesday

KB5077468

KB5077468: Security update for SQL Server 2025, GDR branch, March 2026. Merge replication upgrade privilege flaw patched

In short

The update fixes three Important vulnerabilities; CVE-2026-21262 is publicly disclosed. It also removes a potential SQL injection path and blocks ALTER USER against the system Administrator login.

Does it affect you? Applies to: SQL Server 2025 on Windows or Linux, all editions. You must have SQL Server 2025 or a SQL Server 2025 GDR release installed.

Build
17.0.1105.2
Servicing branch
GDR
Security
3 fixed
Restart
Required

For servers on the GDR branch: they get security fixes only. Servers that install cumulative updates (CU branch) get a separate update. Which branch am I on?

What changes

Fixes 3 changes

Internal System Metadata

  • A potential SQL injection path is removed.1
    Removes an internal system stored procedure. Applies to Windows.

Replication

  • A privilege flaw in the merge replication version upgrade process is fixed.2
    Fixes an elevation-of-privilege vulnerability. Applies to Windows.

Security Infrastructure

  • The ALTER USER operation is blocked when the target login is the system Administrator account.3
    Applies to Linux and Windows.

Technical details

Data sheet · Security · Downloads · Components Click to collapse or expand

Data sheet

Released
2026-03-10
Classification
Security Updates
Type
Cumulative update
Servicing branch
GDR
Restart
Required
Replaces
KB5073177
Replaced by
KB5084814
VersionBuildChannel
2025 17.0.1105.2 General availability

Security

3 vulnerabilities fixed
3 important
VulnerabilitySeverityCVSS
CVE-2026-21262
Microsoft SQL Server Elevation of Privilege Vulnerability
 Important 8.8
CVE-2026-26115
SQL Server Elevation of Privilege Vulnerability
 Important 8.8
CVE-2026-26116
SQL Server Elevation of Privilege Vulnerability
 Important 8.8

Downloads (Microsoft Update Catalog)

Package 2025
325.4 MB
sqlserver2025-kb5077468-x64.exe Main update · KB5077468 SHA-1: d7ac10c9…31f694

Updated components

141 files changed since the previous update for the same versions.

Top changed componentsFiles
SQL Server Engine114
SQL Server PolyBase3

Sources

Updated
Cited passages from Microsoft's official notes (3)
  1. 1. Fixes a potential SQL injection vulnerability by removing an internal system stored procedure. support.microsoft.com
  2. 2. Fixes an elevation of privilege vulnerability in the version upgrade process for merge replication. support.microsoft.com
  3. 3. This hotfix blocks the ALTER USER operation if the target login is the system Administrator account. support.microsoft.com
Checked automatically: 8 of 8 checks passed, 3 quoted passages · compared with Microsoft's page on Sep 26, 2026
  • Quotes found in the official pages: passed
  • Numbers found in the sources: passed
  • Vulnerabilities from the dossier only: passed
  • Links to allowed domains only: passed
  • Every official change covered: passed
  • Readable plain text: passed
  • Changes confirmed by the file list: passed
  • Sources agree: passed

A second AI read the text against the sources: correctness 5/5, clarity 4/5, completeness 5/5. How we work

Published by The Update Bureau. Written with AI from Microsoft's own documents, checked by rules and a second AI. How we work · Report a mistake