FWP allows to subscribe to feeds that are protected with BasicAuth or DigestAuth. When SIC-Em discovers images in the feed, it does not use the security settings of the feed and thus fails.
Note: as BasicAuth just uses Base64 to transfer the password, SIC-Em should check the image URL's FQDN part against the feed URL's FQDN to limit leaking it.
FWP allows to subscribe to feeds that are protected with BasicAuth or DigestAuth. When SIC-Em discovers images in the feed, it does not use the security settings of the feed and thus fails.
Note: as BasicAuth just uses Base64 to transfer the password, SIC-Em should check the image URL's FQDN part against the feed URL's FQDN to limit leaking it.