Description
mod_auth_openidc is an OpenID Certified™ authentication and authorization module for the Apache 2.x HTTP server. Versions prior to 2.4.12.2 are vulnerable to Open Redirect. When providing a logout parameter to the redirect URI, the existing code in oidc_validate_redirect_url() does not properly check for URLs that start with /\t, leading to an open redirect. This issue has been patched in version 2.4.12.2. Users unable to upgrade can mitigate the issue by configuring mod_auth_openidc to only allow redirection when the destination matches a given regular expression with OIDCRedirectURLsAllowed.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| zmartzone | mod_auth_openidc | < 2.4.12.2 | — |
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 | 2.4.12.2-1 | — |
| Debian 13 | libapache2-mod-auth-openidc | 2.4.12.2-1 | — |
| Debian 12 | libapache2-mod-auth-openidc | 2.4.12.2-1 | — |
| Debian 10 | libapache2-mod-auth-openidc | 2.3.10.2-1+deb10u3 | DLA-3499-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 22.04 LTS | libapache2-mod-auth-openidc | No fix yet | — |
| Ubuntu 20.04 LTS | libapache2-mod-auth-openidc | No fix yet | — |
| Ubuntu 18.04 LTS | libapache2-mod-auth-openidc | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | mod_auth_openidc | 2.4.9.4-4.el9 | RHSA-2023:6365 |
| RHEL 8 | cjose +1 | 0.6.1-4.module+el8.9.0+19469+5b493da9 | RHSA-2023:6940 |
| RHEL 8 | mod_auth_openidc | 2.4.9.4-5.module+el8.9.0+18723+672ccf5d | RHSA-2023:6940 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | mod_auth_openidc | 2.4.9.4-4.el9 | ALSA-2023:6365 |
| AlmaLinux 8 | cjose +1 | 0.6.1-4.module_el8.9.0+3631+0ced13d7 | ALSA-2023:6940 |
| AlmaLinux 8 | mod_auth_openidc | 2.4.9.4-5.module_el8.9.0+3631+0ced13d7 | ALSA-2023:6940 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 8 | cjose | 0.6.1-4.module+el8.9.0+1384+4b58c166 | RLSA-2023:6940 |
| Rocky Linux 8 | mod_auth_openidc | 2.4.9.4-5.module+el8.9.0+1384+4b58c166 | RLSA-2023:6940 |
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 SP4 | apache2-mod_auth_openidc | 2.3.8-150100.3.22.1 | SUSE-SU-2023:0215-1 |
| SLES 12 SP5 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
| SLES 12 SP4 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP5 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
| SLES for SAP 12 SP4 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
| SLE Real Time 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.22.1 | SUSE-SU-2023:0215-1 |
| SUSE OpenStack Cloud Crowbar 9 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
| SUSE OpenStack Cloud 9 | apache2-mod_auth_openidc | 2.4.0-7.9.1 | SUSE-SU-2023:1837-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2-mod_auth_openidc | 2.4.12.2-1.1 | openSUSE-SU-2024:12584-1 |
| openSUSE Leap 15.6 | apache2-mod_auth_openidc | 2.4.17.1-150600.16.14.1 | SUSE-SU-2025:4532-1 |
| openSUSE Leap 15.4 | apache2-mod_auth_openidc | 2.3.8-150100.3.22.1 | SUSE-SU-2023:0215-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | mod_auth_openidc | 2.4.14.2-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | mod_auth_openidc | 2.4.9.4-4.el9 | ELSA-2023-6365 |
| Oracle Linux 8 | cjose +1 | 0.6.1-4.module+el8.9.0+90009+6a7196cf | ELSA-2023-6940 |
| Oracle Linux 8 | mod_auth_openidc | 2.4.9.4-5.module+el8.9.0+90009+6a7196cf | ELSA-2023-6940 |
Advisories 13
- WID-SEC-2023-2853 Red Hat Enterprise Linux: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 8, 2026
- RLSA-2023:6940 Moderate: mod_auth_openidc:2.3 security and bug fix update Rocky Linux Security Advisories · Nov 5, 2026
- ALSA-2023:6940 Moderate: mod_auth_openidc:2.3 security and bug fix update AlmaLinux Security Advisories · Nov 5, 2026
- ALSA-2023:6365 Moderate: mod_auth_openidc security and bug fix update AlmaLinux Security Advisories · Oct 29, 2026
- DLA-3499-1 libapache2-mod-auth-openidc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:12584-1 apache2-mod_auth_openidc-2.4.12.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:0215-1 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-2023:1837-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- RHSA-2023:6940 Red Hat Security Advisory: mod_auth_openidc:2.3 security and bug fix update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- RHSA-2023:6365 Red Hat Security Advisory: mod_auth_openidc security and bug fix update Red Hat Security Advisories (RHSA) · Nov 22, 2025
- ELSA-2023-6940 Moderate: mod_auth_openidc:2.3 security and bug fix update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 18, 2023
- ELSA-2023-6365 Moderate: mod_auth_openidc security and bug fix update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 11, 2023