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TI-2021-12458 Aliases CVE-2021-32792

XSS vulnerability when using OIDCPreservePost On in mod_auth_openidc

Priority LOW 30CWE-79Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Cross-site scripting
Confidentiality · integrity · availability
Low · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-79.

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 mod_auth_openidc before version 2.4.9, there is an XSS vulnerability in when using `OIDCPreservePost On`.

Why it matters now

EPSS 0.0151 74th percentileScored 2026-11-07
Fix Fixed mod_auth_openidc (zmartzone): 2.4.9Red Hat: 1 advisory

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenIDCmod_auth_openidcbefore 2.4.92.4.9Patch availableCNA
  • mod_auth_openidc VendorOpenIDC Affected before 2.4.9 Fixed in 2.4.9 Patch available CNA

CPE configurations NVD · 4

CPEVersionsRoleVendor
cpe:2.3:a:openidc:mod_auth_openidc:*:*:*:*:*:*:*:*before 2.4.9VulnerableOpenIDC
cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*2.0.0 – 2.4.48Running onApache
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*34VulnerableFedoraproject
  • cpe:2.3:a:openidc:mod_auth_openidc:*:*:*:*:*:*:*:* Versions before 2.4.9 Vulnerable ·OpenIDC
  • cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* Versions 2.0.0 – 2.4.48 Running on ·Apache
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject
  • cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* Versions 34 Vulnerable ·Fedoraproject

Remediation

  • Fix · CNA mod_auth_openidc (zmartzone) Fixed in 2.4.9

Red Hat 1 advisory

  • RHSA-2022:1823 Released 2022-05-10 · Red Hat rating Moderate
    mod_auth_openidc:2.3 security update
    • Red Hat Enterprise Linux AppStream (v. 8) cjose-0.6.1-2.module+el8+2454+f890a43a.aarch64::mod_auth_openidc:2.3, cjose-0.6.1-2.module+el8+2454+f890a43a.ppc64le::mod_auth_openidc:2.3, cjose-0.6.1-2.module+el8+2454+f890a43a.s390x::mod_auth_openidc:2.3 +11

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

  • Advisory ·

    zmartzone mod_auth_openidc — FEDORA-2021-e3017c538a

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2021-12452 Open Redirect in oidc_validate_redirect_url()Priority LOW 32
    • TI-2021-12457 Hardcoded static IV and AAD with a reused key in AES GCM encryption in mod_auth_openidcPriority LOW 29
    Show all 3 records → Advisory →
  • Advisory ·

    zmartzone mod_auth_openidc — FEDORA-2021-17f5cedf66

    3 records Highest priority Priority LOW 3 LOW

    Other records, highest priority first

    • TI-2021-12452 Open Redirect in oidc_validate_redirect_url()Priority LOW 32
    • TI-2021-12457 Hardcoded static IV and AAD with a reused key in AES GCM encryption in mod_auth_openidcPriority LOW 29
    Show all 3 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux AppStream (v. 8)Fixed RHSA-2022:1823
Not affected: 2 products
  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 9

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-32792

References

Patch 4

Advisory 3

Other 1

  • TI-2024-16331 Denial of service when manipulating mod_auth_openidc_session_chunks cookie in mod_auth_openidc CVSS 3.1HIGH 7.5
  • TI-2017-04220 The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka mod_auth_openidc)… CVSS 3.0HIGH 8.6
  • TI-2017-03971 The "OpenID Connect Relying Party and OAuth 2.0 Resource Server" (aka mod_auth_openidc)… CVSS 3.0HIGH 8.6
  • TI-2023-13144 mod_auth_openidc core dump when OIDCStripCookies is set and an empty Cookie header is supplied CVSS 3.1HIGH 7.5
  • TI-2017-03968 Mod_auth_openidc.c in the Ping Identity OpenID Connect authentication module for Apache… CVSS 3.1HIGH 7.5
  • TI-2021-03944 Uncontrolled resource consumption in OpenIDC mod_auth_openidc CVSS 3.1HIGH 7.5
See all 14 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences