KB4505726 - FIX: Dynamic Data Masking does not function as expected in SQL Server 2017

Symptoms

Assume that you use Dynamic Data Masking (DDM) on a column in a table in SQL Server 2017 to mask sensitive data. When a low privileged user runs a specially crafted query, then the masked data may be exposed.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

Resolution

This issue is fixed in the following cumulative update for SQL Server:

About cumulative updates for SQL Server:

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:

References

Learn about the terminology that Microsoft uses to describe software updates.

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