Hello Eobot, I am able to sign up on your web application using a long 100000 characters password which may lead to website becoming unavailable or unresponsive. Usually this problem is caused by a vulnerable password hashing implementation. When a long password is sent, the password hashing process will result in CPU and memory exhaustion.
Normally all sites have a password minimum to maximum length like 72 words limit or 48 limit to prevent Denial Of Service attack. Please verify and reply me back if you find this a issue a risk threak. Thanks, Gopesh Sharma