In NCH Express Accounts 8.24 and earlier, an authenticated low-privilege user can enter a crafted URL to access higher-privileged functionalities such as Add/Edit users.
https://tejaspingulkar.blogspot.com/2020/12/cve-2020-13474-nch-express-accounts.html
https://cvewalkthrough.com/cve-2020-13474-nch-express-accounts-privilege-escalation/