KB5089270: Security update for SQL Server 2016, Azure Connect Feature Pack branch, May 2026. Web Service Task flaw addressed; linked-server error remains

The update addresses an XML external entity vulnerability in the Web Service Task. Linked server queries using MSDASQL can still fail with error 7416.

Does it affect you? Applies to: SQL Server 2016 SP3 systems with the Azure Connect Feature Pack installed. The update package is for x64 systems.

Review notes Additional details from the official release notes (2) Read notes

What changes The Web Service Task vulnerability can let an attacker read arbitrary files from the local file system or cause a denial-of-service attack.
Known issues The error affects SQL Server users running linked-server queries that use MSDASQL and specify a provider string.

The official sources are linked at the end of the page.

For servers on the Azure Connect Feature Pack of Service Pack 3, the branch with fixes beyond security. Servers on the GDR branch (security fixes only) get a separate update. Which branch am I on?

What changes

Fix 1 change

Integration Services

The Web Service Task fix addresses an XML external entity vulnerability that could let an attacker read local files or cause a denial-of-service attack.¹
Bug reference 5131023; platform: Windows.

Known issues

Open Affects: Everyone

Linked server queries that use MSDASQL fail with error 7416

Linked server queries that use the MSDASQL provider and specify a provider string can fail with error 7416, even if earlier builds allowed the connection.²

Workaround status No workaround yet

Microsoft has not published a manual workaround for this issue yet. Monitor release health until a resolving update is available.

Technical details

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

Data sheet

Released: 2026-05-12
Classification: Security Updates
Type: Cumulative update
Servicing branch: Azure Connect Feature Pack
Restart: Required
Replaces: KB5084820, KB5077473, KB5068400, KB5065227

+6 earlier
KB5063761, KB5058717, KB5046856, KB5046062, KB5042209, KB5040944
Replaced by: KB5102339

Version	Build	Channel
2016	13.0.7085.1	General availability

Security

1 vulnerability fixed

1 important

Vulnerability	Severity	CVSS
CVE-2026-40370 SQL Server Remote Code Execution Vulnerability	Important	8.8

Downloads (Microsoft Update Catalog)

Package 2016

508.4 MB

sqlserver2016-kb5089270-x64.exe Main update · KB5089270 SHA-1: 8256edd8…77a338

Updated components

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

Top changed components	Files
SQL Server Engine	77

Sources

Microsoft Support: KB5089270

Updated Oct 26, 2026

Cited passages from Microsoft's official notes (2)

1. This fix addresses an XML external entity (XXE) vulnerability in the Web Service Task that allows an attacker to read arbitrary files from the local file system or cause a denial-of-service (DoS) attack. support.microsoft.com
2. Linked server queries that use the MSDASQL (OLE DB Provider for ODBC Drivers) provider and specify a provider string (@provstr) fail and return the following error message: *Msg 7416, Level 16 support.microsoft.com

Checked automatically: 8 of 8 checks passed, 2 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