No. WebCatalog does not store or have access to the passwords or login credentials you enter into websites and apps.
The WebCatalog desktop app works like a web browser. When you sign in to a website such as Google, Microsoft, Slack, or another service, your credentials are handled directly by that service.
After you sign in, cookies, login sessions, and other website data are stored locally on your device. They are not uploaded to WebCatalog or synced through your WebCatalog account.
Because WebCatalog does not store your website credentials or login sessions, they cannot be exposed through WebCatalog's servers. Even if WebCatalog's systems were compromised or WebCatalog were no longer operating, this data would remain on your device.
This also means signing in to your WebCatalog account on another device does not automatically sign you in to the websites and apps you use inside WebCatalog.