CVE-2026-35490: changedetection.io Vulnerable to Authentication Bypass via Decorator Ordering

On 13 routes across 5 blueprint files, the @login_optionally_required decorator is placed before (outer to) @blueprint.route() instead of after it. In Flask, @route() must be the outermost decorator because it registers the function it receives. When the order is reversed, @route() registers the original undecorated function, and the auth wrapper is never in the call chain. This silently disables authentication on these routes.

The developer correctly uses the decorator on 30+ other routes with the proper order, making this a classic consistency gap.