🛡️ CVE-2023-2422 — keycloak

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-295 NVD
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Keycloak vulnerable to Improper Client Certificate Validation for OAuth/OpenID clients

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

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity low, availability none.

Weakness class

CVE-2023-2422 is classified as CWE-295: Improper Certificate Validation. A TLS certificate is accepted without proper verification, so a man-in-the-middle can present their own.

Affected software

CVE-2023-2422 is recorded against 4 packages.

  • keycloak
  • openshift-container-platform
  • org.keycloak:keycloak-services (fixed in 21.1.2)
  • single-sign-on

Timeline and source

Published on 4 October 2023 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
bugzilla.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
access.redhat.com
bugzilla.redhat.com

Details

Severity MEDIUM
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N
CWE CWE-295
Public Exploit ✅ No
Source NVD
Published 2023-10-04
Updated 2026-08-12
Modified 2026-06-17
Fix URL N/A

Affected Packages

Software From version Fixed in
keycloak
openshift-container-platform
org.keycloak:keycloak-services 21.1.2
single-sign-on

References

Issue Tracking, Vendor Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2191668
Issue Tracking, Vendor Advisory https://bugzilla.redhat.com/show_bug.cgi?id=2191668

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