cvedb.io
CVE-2021-39191
MEDIUM · CVSS 4.7
EPSS exploitation probability: 0%
Published 2021-09-03T14:15:07.210 · Last modified 2026-06-17T04:03:16.853

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 2.4.9.4, 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.

Affected products

openidc — mod_auth_openidc

Does this affect you?

Add your gear to cvedb and we'll alert you only when openidc ships something exploited.

Check my exposure →

References

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