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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 2.4.9.4, the 3rd-party init SSO functionality of mod_auth_openidc was reported to be vulnerable to an open redirect attack by supplying a crafted URL in the `target_link_uri` parameter. A patch in version 2.4.9.4 made it so that the `OIDCRedirectURLsAllowed` setting must be applied to the `target_link_uri` parameter. There are no known workarounds aside from upgrading to a patched version.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade cjoseUpgrade mod_auth_openidcUpgrade cjose-devel | May 13, 2022 | Sep 3, 2021 |
| Centos_linux | — | Upgrade cjoseUpgrade cjose-debugsourceUpgrade cjose-debuginfoUpgrade mod_auth_openidcUpgrade mod_auth_openidc-debugsourceUpgrade mod_auth_openidc-debuginfoUpgrade cjose-devel | May 13, 2022 | Sep 3, 2021 |
| Debian | — | Upgrade libapache2-mod-auth-openidc | Jul 24, 2023 | Sep 3, 2021 |
| Oracle_linux | — | Upgrade cjoseUpgrade mod_auth_openidcUpgrade cjose-devel | May 18, 2022 | Sep 3, 2021 |
| Redhat_linux | — | Upgrade cjose-develUpgrade cjose-debuginfoUpgrade mod_auth_openidcUpgrade mod_auth_openidc-debuginfoUpgrade cjoseNo solution existsUpgrade mod_auth_openidc-debugsourceUpgrade cjose-debugsource | May 13, 2022 | Sep 3, 2021 |
| Rocky_linux | — | Upgrade cjose-debugsourceUpgrade mod_auth_openidc-debuginfoUpgrade mod_auth_openidc-debugsourceUpgrade cjoseUpgrade cjose-debuginfoUpgrade cjose-develUpgrade mod_auth_openidc | Mar 5, 2024 | Sep 3, 2021 |
| Suse | — | Upgrade apache2-mod_auth_openidc | Oct 13, 2021 | Sep 3, 2021 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Sep 3, 2021 |
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