The Update BureauKB5083245: Security update for SQL Server 2025, CU branch, April 2026. Linked-server privilege flaw fixed; MSDASQL queries can fail
The update fixes two SQL Server vulnerabilities, including a linked-server privilege issue. Linked-server queries using MSDASQL and a provider string might fail with error 7416.
Does it affect you? Applies to: SQL Server 2025 on Windows and Linux, all editions.
Review notes Additional details from the official release notes (2) Read notes
- In detail The page identifies both CVEs as SQL Server elevation-of-privilege vulnerabilities, but does not state which CVE corresponds to the linked-server fix.
- Known issues The issue concerns certain SQL Server linked-server configurations using MSDASQL and a provider string; it does not affect everyone.
The official sources are linked at the end of the page.
For servers on the CU branch: they install cumulative updates, which also bring fixes beyond security. Servers on the GDR branch (security fixes only) get a separate update. Which branch am I on?
What changes
Fixes 2 changes
Linked Server
-
A linked-server privilege vulnerability is addressed. It could let a low-privileged SQL Server user gain sysadmin permissions.1
Applies to SQL Server on Linux and Windows.
SQL Agent
-
An SQL injection vulnerability that could let an authorized attacker elevate privileges over a network is resolved.2
Applies to SQL Server on Windows.
Known issues
-
Linked server queries that use MSDASQL fail with error 7416
Linked-server queries using the
MSDASQLprovider and a provider string might fail with error 7416, reporting that no login mapping exists. The Database Engine's stricter connection validation can reject certain configurations that worked in earlier builds.3How to apply the workaround WorkaroundUse the workaround guidance in the linked Microsoft troubleshooting article.3
Technical details
Data sheet · Security · Downloads · Components Click to collapse or expand
Data sheet
- Released
- 2026-04-14
- Classification
- Security Updates
- Type
- Cumulative update
- Servicing branch
- CU
- Restart
- Required
- Replaces
- KB5077896, KB5077466, KB5075211, KB5078298
- Replaced by
- KB5089899
| Version | Build | Channel |
|---|---|---|
| 2025 | 17.0.4030.1 | General availability |
Security
| Vulnerability | Severity | CVSS |
|---|---|---|
|
SQL Server Elevation of Privilege Vulnerability
|
Important | 6.7 |
|
SQL Server Elevation of Privilege Vulnerability
|
Important | 6.7 |
Downloads (Microsoft Update Catalog)
Updated components
139 files changed since the previous update for the same versions.
| Top changed components | Files |
|---|---|
| SQL Server Engine | 111 |
| SQL Server PolyBase | 2 |
Sources
Cited passages from Microsoft's official notes (3)
-
1.
This fix addresses an elevation of privilege vulnerability in SQL Server linked servers that allows a low-privileged SQL Server user to gain sysadmin permissions.
support.microsoft.com -
2.
This fix resolves an issue in SQL Server in which improper neutralization of special elements in SQL commands (SQL injection) allows an authorized attacker to elevate privileges over a network.
support.microsoft.com -
3.
For more information and workarounds, see Linked server queries that use MSDASQL fail with error 7416.
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 3/5, 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