We are developing REST APIs using python framework called FastAPI. The code security test failed for html injection. They are sending some html tag code in the post payload, we are inserting that in DB and sending same in GET Response. Is there any way to prevent this HTML injection while processing request in FastAPI.
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yes. No framework is going to magically change the content you get without you being explicit about it. (Imagine if it was a REST API for recording HTML snippets from an internal system to be used in rendering web pages in another endpoint: you'd need the HTML as is)
It is just a matter of calling a escape function on your input data, before putting that on the db.
Python's standard library
html.escapefunction suffices in this case.There is no code in your question, and I don't know FASTAPI by heart - but if it puts the payload in the DB without going through any code you write, then you should either customize that and put in this call to preprocess your data, or add a triggered stage (that is, an event subscriber) that will do that for you.