How to override /login?logout_failure redirect in Dockerized cBioPortal (v6.x) without modifying source?

[patheyacine]

We’re using the latest version of cBioPortal in a Dockerized setup (v6.x), with Azure OAuth2 for authentication. When a user is unauthorized or disabled in the DB, they are redirected to /login?logout_failure, which shows a hardcoded MSK error page.
We want to show a custom logout/error page instead — but without modifying the source code or rebuilding the frontend.
Is there a supported way to:

• Override or intercept /login?logout_failure

• Redirect to a custom static HTML page

• Possibly configure this via application.properties or environment variables?

We’re currently considering a reverse proxy (NGINX) workaround, but would prefer a cleaner or officially supported approach if available.

Thanks in advance!