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TI-2023-02276 Aliases CVE-2023-2422GHSA-3qh5-qqj2-c78f

Keycloak: oauth client impersonation

Priority LOW 32CWE-295Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Spoofing
Confidentiality · integrity · availability
High · Low · None
Fix status
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-295.

Summary

A flaw was found in Keycloak. A Keycloak server configured to support mTLS authentication for OAuth/OpenID clients does not properly verify the client certificate chain. A client that possesses a proper certificate can authorize itself as any other client, therefore, access data that belongs to other clients.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00522 44th percentileScored 2026-11-07
Fix Fixed org.keycloak:keycloak-services (Maven): 21.1.2Red Hat: 5 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
Red HatRed Hat Single Sign-On 7——Not affectedCNA
Red HatRed Hat Single Sign-On 7.6 for RHEL 7—18.0.8-1.redhat_00001.1.el7ssoPatch availableCNA
Red HatRed Hat Single Sign-On 7.6 for RHEL 8—18.0.8-1.redhat_00001.1.el8ssoPatch availableCNA
Red HatRed Hat Single Sign-On 7.6 for RHEL 9—18.0.8-1.redhat_00001.1.el9ssoPatch availableCNA
Red HatRHEL-8 based Middleware Containers—7.6-24Patch availableCNA
—org.keycloak:keycloak-services (Maven)before 21.1.221.1.2Patch availableGHSA-3qh5-qqj2-c78f
  • Red Hat Single Sign-On 7 VendorRed Hat Affected — Fixed in — Not affected CNA
  • Red Hat Single Sign-On 7.6 for RHEL 7 VendorRed Hat Affected — Fixed in 18.0.8-1.redhat_00001.1.el7sso Patch available CNA
  • Red Hat Single Sign-On 7.6 for RHEL 8 VendorRed Hat Affected — Fixed in 18.0.8-1.redhat_00001.1.el8sso Patch available CNA
  • Red Hat Single Sign-On 7.6 for RHEL 9 VendorRed Hat Affected — Fixed in 18.0.8-1.redhat_00001.1.el9sso Patch available CNA
  • RHEL-8 based Middleware Containers VendorRed Hat Affected — Fixed in 7.6-24 Patch available CNA
  • org.keycloak:keycloak-services (Maven) Vendor— Affected before 21.1.2 Fixed in 21.1.2 Patch available GHSA-3qh5-qqj2-c78f

CPE configurations NVD · 9

CPEVersionsRoleVendor
cpe:2.3:a:redhat:keycloak:-:*:*:*:*:*:*:*not specified by NVDVulnerableRed Hat
cpe:2.3:a:redhat:openshift_container_platform:4.9:*:*:*:*:*:*:*4.9VulnerableRed Hat
cpe:2.3:a:redhat:openshift_container_platform:4.10:*:*:*:*:*:*:*4.10VulnerableRed Hat
cpe:2.3:a:redhat:openshift_container_platform:4.11:*:*:*:*:*:*:*4.11VulnerableRed Hat
cpe:2.3:a:redhat:openshift_container_platform:4.12:*:*:*:*:*:*:*4.12VulnerableRed Hat
cpe:2.3:a:redhat:single_sign-on:7.6:*:*:*:*:*:*:*7.6VulnerableRed Hat
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*7.0Running onRed Hat
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*8.0Running onRed Hat
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*9.0Running onRed Hat
  • cpe:2.3:a:redhat:keycloak:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openshift_container_platform:4.9:*:*:*:*:*:*:* Versions 4.9 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openshift_container_platform:4.10:*:*:*:*:*:*:* Versions 4.10 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openshift_container_platform:4.11:*:*:*:*:*:*:* Versions 4.11 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:openshift_container_platform:4.12:*:*:*:*:*:*:* Versions 4.12 Vulnerable ·Red Hat
  • cpe:2.3:a:redhat:single_sign-on:7.6:*:*:*:*:*:*:* Versions 7.6 Vulnerable ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* Versions 7.0 Running on ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Running on ·Red Hat
  • cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Running on ·Red Hat

Remediation

  • Fix · GHSA-3qh5-qqj2-c78f org.keycloak:keycloak-services (Maven) Fixed in 21.1.2 Advisory →

Red Hat 5 advisories

  • RHSA-2023:3883 Released 2023-06-27 · Red Hat rating Important
    Red Hat Single Sign-On 7.6.4 security update on RHEL 7
    • Red Hat Single Sign-On 7.6 for RHEL 7 Server rh-sso7-keycloak-18.0.8-1.redhat_00001.1.el7sso, rh-sso7-keycloak-server-18.0.8-1.redhat_00001.1.el7sso
  • RHSA-2023:3892 Released 2023-06-27 · Red Hat rating Important
    Red Hat Single Sign-On 7.6.4 security update
    • Red Hat Single Sign-On 7
  • RHSA-2023:3884 Released 2023-06-27 · Red Hat rating Important
    Red Hat Single Sign-On 7.6.4 security update on RHEL 8
    • Red Hat Single Sign-On 7.6 for RHEL 8 rh-sso7-keycloak-18.0.8-1.redhat_00001.1.el8sso, rh-sso7-keycloak-server-18.0.8-1.redhat_00001.1.el8sso
Show 2 more Red Hat advisories
  • RHSA-2023:3885 Released 2023-06-27 · Red Hat rating Important
    Red Hat Single Sign-On 7.6.4 security update on RHEL 9
    • Red Hat Single Sign-On 7.6 for RHEL 9 rh-sso7-keycloak-18.0.8-1.redhat_00001.1.el9sso, rh-sso7-keycloak-server-18.0.8-1.redhat_00001.1.el9sso
  • RHSA-2023:3888 Released 2023-06-27 · Red Hat rating Important
    Red Hat Single Sign-On 7.6.4 for OpenShift image security enhancement update
    • Middleware Containers for OpenShift rh-sso-7/sso76-openshift-rhel8

Vendor assessments

Red Hat

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

ProductStatusPlan or fix
Middleware Containers for OpenShiftFixed RHSA-2023:3888
Red Hat Single Sign-On 7Fixed RHSA-2023:3892
Red Hat Single Sign-On 7.6 for RHEL 7 ServerFixed RHSA-2023:3883
Red Hat Single Sign-On 7.6 for RHEL 8Fixed RHSA-2023:3884
Red Hat Single Sign-On 7.6 for RHEL 9Fixed RHSA-2023:3885

Timeline

  1. 2026-10-02 Threatist record created from CVE-2023-2422
  2. 2026-10-03 Alias added: GHSA-3qh5-qqj2-c78f

References

Advisory 8

Other 3

  • TI-2024-01049 Keycloak: path transversal in redirection validation CVSS 3.1HIGH 8.1
  • TI-2023-26623 The SSH transport protocol with certain OpenSSH extensions, found in OpenSSH before 9.6… CVSS 3.1MEDIUM 5.9
  • TI-2020-08665 Server-side request forgery in keycloak CVSS 3.1MEDIUM 5.3
  • TI-2022-03468 Path traversal in Red Hat Keycloak CVSS 3.1CRITICAL 9.1
  • TI-2021-03612 A POST based reflected Cross Site Scripting vulnerability on has been identified in Keycloak. CVSS 3.1MEDIUM 6.1
  • TI-2022-03994 Cross-site scripting in keycloak CVSS 3.1CRITICAL 10.0
See all 97 →

Sources

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