I found out that the salary expectation I've stated in my application (it was required) is 10K below what the company usually pays people with profiles similar to me
Other people's salaries should not be a factor in your negotiations. However, knowing that your potential employer may be willing to pay more than you've asked for can be.
I wonder if/how I can say that my salary expectation should be 10K more than what I stated in my application?
Now is not the best time to do this. You have stated the lower bound of your desired salary in the application, but it does not mean you must stick to that number.
Attend the HR interview and all subsequent interviews when/if they follow. Get a better understanding of the job requirements, responsibilities, and challenges, of other benefits and perks available to you, of how well you think you and your potential employer fit each other, and whether they really want you (and therefore are willing to negotiate further).
If in the course of these interviews you are asked to confirm your salary requirements, you can choose to either to try and defer answering such question until later in the interviewing stage, or, if they absolutely insist, state your "updated" figure.
When/if the job offer comes, and it does not already state your desired X + 10K salary, then you can propose a counter-offer with the higher salary; at that point you should have better arguments supporting it than saying "oh, sorry, I made a typo".