Provide references for CVE-2021-44878.
Where can I find more information about CVE-2021-44878?
References are available at: https://github.com/pac4j/pac4j/commit/22b82ffd702a132d9f09da60362fc6264fc281ae, https://openid.net/specs/openid-connect-core-1_0.html#IDToken, https://www.pac4j.org/blog/cve_2021_44878_is_this_serious.html.