Web Reference: SQL injection UNION attacks When an application is vulnerable to SQL injection, and the results of the query are returned within the application's responses, you can use the UNION keyword to retrieve data from other tables within the database. This is commonly known as a SQL injection UNION attack. Let's now see how the attacker can take advantage of this UNION attack to extract sensible data. The first step is to gather information about the database schema by crafting a valid SELECT statement. Jul 23, 2025 · Union-based SQL injection involves the use of the UNION operator that combines the results of multiple SELECT statements to fetch data from multiple tables as a single result set.
YouTube Excerpt: 00:00 Introduction 00:30 Context 02:22 Step 1 : Finding The Number Of Columns 04:20 Step 2: Identifying Displayed Columns ...
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