CVE-2021-32786

mod_auth_openidc is an authentication/authorization module for the Apache
2.x HTTP server that functions as an OpenID Connect Relying Party,
authenticating users against an OpenID Connect Provider. In versions prior
to 2.4.9, oidc_validate_redirect_url() does not parse URLs the same way
as most browsers do. As a result, this function can be bypassed and leads
to an Open Redirect vulnerability in the logout functionality. This bug has
been fixed in version 2.4.9 by replacing any backslash of the URL to
redirect with slashes to address a particular breaking change between the
different specifications (RFC2396 / RFC3986 and WHATWG). As a workaround,
this vulnerability can be mitigated by configuring mod_auth_openidc to
only allow redirection whose destination matches a given regular
expression.