Medium severity4.7NVD Advisory· Published Sep 3, 2021· Updated Jun 17, 2026
CVE-2021-39191
CVE-2021-39191
Description
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.
AI Insight
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Affected products
13- Range: <2.4.9.4
- osv-coords11 versionspkg:rpm/almalinux/cjosepkg:rpm/almalinux/cjose-develpkg:rpm/almalinux/mod_auth_openidcpkg:rpm/opensuse/apache2-mod_auth_openidc&distro=openSUSE%20Leap%2015.4pkg:rpm/opensuse/apache2-mod_auth_openidc&distro=openSUSE%20Leap%2015.6pkg:rpm/suse/apache2-mod_auth_openidc&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP4pkg:rpm/suse/apache2-mod_auth_openidc&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP6pkg:rpm/suse/apache2-mod_auth_openidc&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Server%20Applications%2015%20SP7pkg:rpm/suse/apache2-mod_auth_openidc&distro=SUSE%20Linux%20Enterprise%20Real%20Time%2015%20SP3pkg:rpm/suse/apache2-mod_auth_openidc&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/apache2-mod_auth_openidc&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5
< 0.6.1-2.module_el8.6.0+2868+44838709+ 10 more
- (no CPE)range: < 0.6.1-2.module_el8.6.0+2868+44838709
- (no CPE)range: < 0.6.1-2.module_el8.6.0+2868+44838709
- (no CPE)range: < 2.3.7-11.module_el8.6.0+2868+44838709
- (no CPE)range: < 2.3.8-150100.3.22.1
- (no CPE)range: < 2.4.17.1-150600.16.14.1
- (no CPE)range: < 2.3.8-150100.3.22.1
- (no CPE)range: < 2.4.17.1-150600.16.14.1
- (no CPE)range: < 2.4.17.1-150600.16.14.1
- (no CPE)range: < 2.3.8-150100.3.22.1
- (no CPE)range: < 2.4.0-3.23.1
- (no CPE)range: < 2.4.0-3.23.1
- Range: <=2.4.9.3
Patches
Vulnerability mechanics
References
7- github.com/zmartzone/mod_auth_openidc/commit/03e6bfb446f4e3f27c003d30d6a433e5dd8e2b3dnvdPatchThird Party Advisory
- github.com/zmartzone/mod_auth_openidc/issues/672nvdExploit
- github.com/zmartzone/mod_auth_openidc/security/advisories/GHSA-2pgf-8h6h-gqg2nvdVendor Advisory
- github.com/zmartzone/mod_auth_openidc/releases/tag/v2.4.9.4nvdRelease Notes
- lists.debian.org/debian-lts-announce/2023/07/msg00020.htmlnvdMailing List
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/32RGPW5LZDLDTB7MKZIGAHPSLFOUNWR5/nvd
- lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RHXO4O4G2UQS7X6OQJCVZKHZAQ7SAIFB/nvd
News mentions
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