I have read about JPQL injection and SQL injection. In many sites it has been said that ORM injection is almost as same as SQL injection in a testers point of view. So what basically i want to know is the major differences between JPQL and SQL injections.
What are the differences between a JPQL-Injection and SQL-Injection
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Both JPQL injection and SQL injection are examples of the broader category of Code Injection.
Any language that is parsed at runtime is susceptible to Code Injection.
JPQL or Java Persistence Query Language is similar to SQL in syntax, and in the fact that it is written as strings and parsed at runtime.
When the description says "built dynamically at runtime" they mean your code formats the JPQL query as a Java string, then submits the string to be parsed and executed. Therefore your code has an opportunity to combine fixed strings with variable content.
Here's an example of using parameters safely to combine a variable with a JPQL statement. This comes from https://www.objectdb.com/java/jpa/query/parameter
SAFE:
Here's the same query written in an unsafe way, combining the variable directly into the string.
UNSAFE:
Don't use string concatenation to form JPQL queries if you can avoid it. That's how unsafe content sneaks into your JPQL.