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CVE-2021-32786
MEDIUM · CVSS 4.7
EPSS exploitation probability: 0%
Published 2021-07-22T22:15:08.233 · Last modified 2026-06-17T03:53:37.627

Summary

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 expre

Affected products

openidc — mod_auth_openidc

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References

This product uses data from the NVD API but is not endorsed or certified by the NVD. Informational only; not professional security advice.