Description
mod_auth_openidc is an OpenID Certified authentication and authorization module for the Apache 2.x HTTP server that implements the OpenID Connect Relying Party functionality. Prior to 2.4.16.11, a bug in a mod_auth_openidc results in disclosure of protected content to unauthenticated users. The conditions for disclosure are an OIDCProviderAuthRequestMethod POST, a valid account, and there mustn't be any application-level gateway (or load balancer etc) protecting the server. When you request a protected resource, the response includes the HTTP status, the HTTP headers, the intended response (the self-submitting form), and the protected resource (with no headers). This is an example of a request for a protected resource, including all the data returned. In the case where mod_auth_openidc returns a form, it has to return OK from check_userid so as not to go down the error path in httpd. This means httpd will try to issue the protected resource. oidc_content_handler is called early, which has the opportunity to prevent the normal output being issued by httpd. oidc_content_handler has a number of checks for when it intervenes, but it doesn't check for this case, so the handler returns DECLINED. Consequently, httpd appends the protected content to the response. The issue has been patched in mod_auth_openidc versions >= 2.4.16.11.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| OpenIDC | mod_auth_openidc | < 2.4.16.11 | — |
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 | 2.4.16.11-1 | — |
| Debian 13 | libapache2-mod-auth-openidc | 2.4.16.11-1 | — |
| Debian 12 | libapache2-mod-auth-openidc | 2.4.12.3-2+deb12u3 | DSA-5904-1 |
| Debian 11 | libapache2-mod-auth-openidc | 2.4.9.4-0+deb11u5 | DLA-4129-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | libapache2-mod-auth-openidc | No fix yet | — |
| Ubuntu 24.04 LTS | libapache2-mod-auth-openidc | 2.4.15.1-1ubuntu0.1 | USN-7446-1 |
| Ubuntu 22.04 LTS | libapache2-mod-auth-openidc | 2.4.11-1ubuntu0.1 | USN-7446-1 |
| 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 10 | mod_auth_openidc | 2.4.15-4.el10_0.1 | RHSA-2025:7490 |
| RHEL 9 | mod_auth_openidc | 2.4.10-1.el9_6.1 | RHSA-2025:7419 |
| RHEL 8 | cjose +1 | 0.6.1-4.module+el8.10.0+21813+b5444eb8 | RHSA-2025:3997 |
| RHEL 8 | mod_auth_openidc | 2.4.9.4-7.module+el8.10.0+23023+ba6d7066 | RHSA-2025:3997 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.4 EUS | mod_auth_openidc | 2.4.9.4-4.el9_4.1 | RHSA-2025:4224 |
| RHEL 9.2 EUS | mod_auth_openidc | 2.4.9.4-1.el9_2.2 | RHSA-2025:4225 |
| RHEL 9.0 E4S | mod_auth_openidc | 2.4.9.4-1.el9_0.2 | RHSA-2025:3945 |
| RHEL 8.8 EUS | cjose +1 | 0.6.1-3.module+el8.8.0+19464+578f4546 | RHSA-2025:4128 |
| RHEL 8.8 EUS | mod_auth_openidc | 2.4.9.4-1.module+el8.8.0+23028+2aae5ce6.1 | RHSA-2025:4128 |
| RHEL 8.6 TUS | cjose +1 | 0.6.1-3.module+el8.6.0+19463+7d2e1f9c | RHSA-2025:4192 |
| RHEL 8.6 TUS | mod_auth_openidc | 2.4.9.4-1.module+el8.6.0+23040+515b7c43.1 | RHSA-2025:4192 |
| RHEL 8.6 E4S | cjose +1 | 0.6.1-3.module+el8.6.0+19463+7d2e1f9c | RHSA-2025:4192 |
| RHEL 8.6 E4S | mod_auth_openidc | 2.4.9.4-1.module+el8.6.0+23040+515b7c43.1 | RHSA-2025:4192 |
| RHEL 8.6 AUS | cjose +1 | 0.6.1-3.module+el8.6.0+19463+7d2e1f9c | RHSA-2025:4192 |
| RHEL 8.6 AUS | mod_auth_openidc | 2.4.9.4-1.module+el8.6.0+23040+515b7c43.1 | RHSA-2025:4192 |
| RHEL 8.4 TUS | cjose +1 | 0.6.1-3.module+el8.4.0+19462+14bde120 | RHSA-2025:4227 |
| RHEL 8.4 TUS | mod_auth_openidc | 2.4.9.4-1.module+el8.4.0+23043+b69acfab.1 | RHSA-2025:4227 |
| RHEL 8.4 E4S | cjose +1 | 0.6.1-3.module+el8.4.0+19462+14bde120 | RHSA-2025:4227 |
| RHEL 8.4 E4S | mod_auth_openidc | 2.4.9.4-1.module+el8.4.0+23043+b69acfab.1 | RHSA-2025:4227 |
| RHEL 8.4 AUS | cjose +1 | 0.6.1-3.module+el8.4.0+19462+14bde120 | RHSA-2025:4227 |
| RHEL 8.4 AUS | mod_auth_openidc | 2.4.9.4-1.module+el8.4.0+23043+b69acfab.1 | RHSA-2025:4227 |
| RHEL 8.2 AUS | cjose +1 | 0.6.1-3.module+el8.2.0+19461+3a40b6ee | RHSA-2025:4228 |
| RHEL 8.2 AUS | mod_auth_openidc | 2.4.9.4-1.module+el8.2.0+23039+41dcbbc6 | RHSA-2025:4228 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | mod_auth_openidc | 2.4.15-4.el10_0.1 | ALSA-2025:7490 |
| AlmaLinux 9 | mod_auth_openidc | 2.4.10-1.el9_6.1 | ALSA-2025:7419 |
| AlmaLinux 8 | cjose +1 | 0.6.1-4.module_el8.9.0+3631+0ced13d7 | ALSA-2025:3997 |
| AlmaLinux 8 | mod_auth_openidc | 2.4.9.4-7.module_el8.10.0+3978+e883c40d | ALSA-2025:3997 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | mod_auth_openidc | 2.4.15-4.el10_0.1 | RLSA-2025:7490 |
| Rocky Linux 9 | mod_auth_openidc | 2.4.10-1.el9_6.1 | RLSA-2025:7419 |
| Rocky Linux 8 | cjose | 0.6.1-4.module+el8.9.0+1384+4b58c166 | RLSA-2025:3997 |
| Rocky Linux 8 | mod_auth_openidc | 2.4.9.4-7.module+el8.10.0+1953+b76d6417 | RLSA-2025:3997 |
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 | 2.3.8-150600.16.8.1 | SUSE-SU-2025:4532-1, SUSE-SU-2025:1286-1 |
| SLES 15 SP5 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
| SLES 15 SP4 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
| SLES 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP5 | apache2-mod_auth_openidc | 2.4.0-7.15.1 | SUSE-SU-2025:1465-1, SUSE-SU-2025:1337-1 |
| SLES for SAP 15 SP5 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
| SLES for SAP 15 SP4 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
| SLES for SAP 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
| SLE HPC 15 SP5 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
| SLE HPC 15 SP4 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
| SLE HPC 15 SP3 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
| SUSE Manager Server 4.3 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
| SUSE Manager Proxy 4.3 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
| SUSE Enterprise Storage 7.1 | apache2-mod_auth_openidc | 2.3.8-150100.3.31.1 | SUSE-SU-2025:1324-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | apache2-mod_auth_openidc | 2.4.16.11-1.1 | openSUSE-SU-2025:14972-1 |
| openSUSE Leap 15.6 | apache2-mod_auth_openidc | 2.3.8-150600.16.8.1 | SUSE-SU-2025:4532-1, SUSE-SU-2025:1286-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | mod_auth_openidc | 2.4.16.11-1.amzn2023 | ALAS2023-2025-1188 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | mod_auth_openidc | No fix yet | — |
| Azure Linux 2 (CBL-Mariner) | mod_auth_openidc | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 10 | mod_auth_openidc | 2.4.15-4.el10_0.1 | ELSA-2025-7490 |
| Oracle Linux 9 | mod_auth_openidc | 2.4.10-1.el9_6.1 | ELSA-2025-7419 |
| Oracle Linux 8 | cjose +1 | 0.6.1-4.module+el8.10.0+90549+7b4eddfc | ELSA-2025-3997 |
| Oracle Linux 8 | mod_auth_openidc | 2.4.9.4-7.module+el8.10.0+90549+7b4eddfc | ELSA-2025-3997 |
Advisories 30
- ALSA-2025:7490 Important: mod_auth_openidc security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:7419 Important: mod_auth_openidc security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:3997 Important: mod_auth_openidc:2.3 security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2025:7490 Red Hat Security Advisory: mod_auth_openidc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:7419 Red Hat Security Advisory: mod_auth_openidc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:4228 Red Hat Security Advisory: mod_auth_openidc:2.3 security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:4225 Red Hat Security Advisory: mod_auth_openidc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:4227 Red Hat Security Advisory: mod_auth_openidc:2.3 security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:4224 Red Hat Security Advisory: mod_auth_openidc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:4128 Red Hat Security Advisory: mod_auth_openidc:2.3 security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:4192 Red Hat Security Advisory: mod_auth_openidc:2.3 security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:3997 Red Hat Security Advisory: mod_auth_openidc:2.3 security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- RHSA-2025:3945 Red Hat Security Advisory: mod_auth_openidc security update Red Hat Security Advisories (RHSA) · Jun 30, 2026
- USN-7446-1 libapache2-mod-auth-openidc vulnerability Ubuntu Security Notices (USN) · Apr 27, 2026
- SUSE-SU-2025:1465-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5904-1 libapache2-mod-auth-openidc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4129-1 libapache2-mod-auth-openidc - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2025:14972-1 apache2-mod_auth_openidc-2.4.16.11-1.1 on GA media 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-2025:1324-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1286-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1337-1 Security update for apache2-mod_auth_openidc SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0836 Red Hat Enterprise Linux (mod_auth_openidc): Schwachstelle ermöglicht Offenlegung von Informationen BSI CERT-Bund (WID) · Dec 29, 2025
- RLSA-2025:7419 Important: mod_auth_openidc security update Rocky Linux Security Advisories · Oct 4, 2025
- RLSA-2025:7490 Important: mod_auth_openidc security update Rocky Linux Security Advisories · Oct 3, 2025
- ALAS2023-2025-1188 Moderate: mod_auth_openidc security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Sep 15, 2025
- RLSA-2025:3997 Important: mod_auth_openidc:2.3 security update Rocky Linux Security Advisories · Jul 29, 2025
- ELSA-2025-7490 Important: mod_auth_openidc security update (Oracle Linux 10) Oracle Linux Security Advisories (ELSA) · Jun 27, 2025
- ELSA-2025-7419 Important: mod_auth_openidc security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · May 21, 2025
- ELSA-2025-3997 Important: mod_auth_openidc:2.3 security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Apr 22, 2025