CVE-2022-23527

An open redirect vulnerability was found in mod_auth_openidc, an OpenID Certified™ authentication and authorization module for the Apache 2.x HTTP server. When providing a logout parameter to the redirect URI, the existing code in oidc_validate_redirect_url() does not properly check for URLs that start with /\t, leading to an open redirect.

Mitigation

This vulnerability can mitigated by configuring mod_auth_openidc to only allow redirection whose destination matches a given regular expression with OIDCRedirectURLsAllowed.