Description
A flaw was found in mod_auth_openidc before version 2.4.1. An open redirect issue exists in URLs with a slash and backslash at the beginning.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | libapache2-mod-auth-openidc | 2.4.1-1 | — |
| Debian 13 | libapache2-mod-auth-openidc | 2.4.1-1 | — |
| Debian 12 | libapache2-mod-auth-openidc | 2.4.1-1 | — |
| Debian 10 | libapache2-mod-auth-openidc | 2.3.10.2-1+deb10u2 | DLA-3409-1 |
| Debian 9 | libapache2-mod-auth-openidc | 2.1.6-1+deb9u1 | DLA-2298-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 8 | libapache2-mod-auth-openidc | 1.6.0-1+deb8u3 | DLA-2130-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 8 | cjose +1 | 0.6.1-2.module+el8+2454+f890a43a | RHSA-2020:3032 |
| RHEL 8 | mod_auth_openidc | 2.3.7-4.module+el8.2.0+6919+ac02cfd2.3 | RHSA-2020:3032 |
| RHEL 7 | mod_auth_openidc | 1.8.8-7.el7 | RHSA-2020:3970 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | cjose +1 | 0.6.1-2.module_el8.6.0+2868+44838709 | ALSA-2020:3032 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | cjose | 0.6.1-2.module+el8.3.0+129+2feafa46 | RLSA-2020:3032 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | apache2-mod_auth_openidc | 2.4.17.1-150600.16.14.1 | SUSE-SU-2025:4532-1 |
| SLES 15 SP6 | apache2-mod_auth_openidc | 2.4.17.1-150600.16.14.1 | SUSE-SU-2025:4532-1 |
| SLES 15 SP1 | apache2-mod_auth_openidc | 2.3.8-3.7.1 | SUSE-SU-2020:0705-1 |
| SLES 12 SP5 | apache2-mod_auth_openidc | 2.4.0-3.11.1 | SUSE-SU-2020:0706-1 |
| SLES 12 SP4 | apache2-mod_auth_openidc | 2.4.0-3.11.1 | SUSE-SU-2020:0706-1 |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | apache2-mod_auth_openidc | 2.4.0-3.11.1 | SUSE-SU-2020:0706-1 |
| SLES for SAP 12 SP4 | apache2-mod_auth_openidc | 2.4.0-3.11.1 | SUSE-SU-2020:0706-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | apache2-mod_auth_openidc | 2.4.17.1-150600.16.14.1 | SUSE-SU-2025:4532-1 |
| openSUSE Leap 15.1 | apache2-mod_auth_openidc | 2.3.8-lp151.2.6.1 | openSUSE-SU-2020:0376-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | mod_auth_openidc | 1.8.8-7.amzn2 | ALAS2-2020-1538 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | cjose +1 | 0.6.1-2.module+el8+5139+bcb28322 | ELSA-2020-3032 |
| Oracle Linux 8 | mod_auth_openidc | 2.3.7-4.module+el8.2.0+7637+70221d24.3 | ELSA-2020-3032 |
| Oracle Linux 7 | mod_auth_openidc | 1.8.8-7.el7 | ELSA-2020-3970 |
Advisories 15
- RHSA-2020:3032 Red Hat Security Advisory: mod_auth_openidc:2.3 security and bug fix update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- ALSA-2020:3032 Moderate: mod_auth_openidc:2.3 security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2020:3970 Red Hat Security Advisory: mod_auth_openidc security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- DLA-3409-1 libapache2-mod-auth-openidc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2298-1 libapache2-mod-auth-openidc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2130-1 libapache2-mod-auth-openidc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- RLSA-2020:3032 Moderate: mod_auth_openidc:2.3 security and bug fix update Rocky Linux Security Advisories · Feb 5, 2026
- SUSE-SU-2020:0706-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0376-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4532-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:0705-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-2930 Red Hat Enterprise Linux: Schwachstelle ermöglicht Umgehen von Sicherheitsvorkehrungen BSI CERT-Bund (WID) · Dec 29, 2025
- ALAS2-2020-1538 Low: mod_auth_openidc security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Oct 22, 2020
- ELSA-2020-3970 Low: mod_auth_openidc security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Oct 6, 2020
- ELSA-2020-3032 Moderate: mod_auth_openidc:2.3 security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Jul 29, 2020
References
- https://github.com/zmartzone/mod_auth_openidc/pull/453
- https://github.com/zmartzone/mod_auth_openidc/commit/02431c0adfa30f478cf2eb20ed6ea51fdf446be7
- [debian-lts-announce] 20200229 [SECURITY] [DLA 2130-1] libapache2-mod-auth-openidc security mailing-list
- openSUSE-SU-2020:0376 vendor-advisory
- FEDORA-2020-33d51234cd vendor-advisory
- FEDORA-2020-1106ece93a vendor-advisory
- [debian-lts-announce] 20200729 [SECURITY] [DLA 2298-1] libapache2-mod-auth-openidc security update mailing-list
- [debian-lts-announce] 20230430 [SECURITY] [DLA 3409-1] libapache2-mod-auth-openidc security update mailing-list