Description
A flaw was found in the Kerberos federation provider of Keycloak, an open-source identity and access management solution. When Kerberos password authentication is used without SPNEGO, the system fails to verify the identity of the Key Distribution Center (KDC) by requesting a server ticket. This allows an attacker on the same network to spoof the KDC and bypass the authentication process, potentially gaining unauthorized access to user accounts.
Published: 2026-09-22
Score: 6.8 Medium
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

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History

Tue, 22 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Tue, 22 Sep 2026 08:00:00 +0000

Type Values Removed Values Added
Description A flaw was found in the Kerberos federation provider of Keycloak, an open-source identity and access management solution. When Kerberos password authentication is used without SPNEGO, the system fails to verify the identity of the Key Distribution Center (KDC) by requesting a server ticket. This allows an attacker on the same network to spoof the KDC and bypass the authentication process, potentially gaining unauthorized access to user accounts.
Title Keycloak-services: keycloak-services: potential kdc spoofing bypass when kerberos password authentication is enabled
First Time appeared Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
Weaknesses CWE-347
CPEs cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:red_hat_single_sign_on:7
Vendors & Products Redhat
Redhat build Keycloak
Redhat red Hat Single Sign On
References
Metrics cvssV3_1

{'score': 6.8, 'vector': 'CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'}


Subscriptions

Redhat Build Keycloak Red Hat Single Sign On
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-22T14:36:35.259Z

Reserved: 2026-09-22T06:42:35.840Z

Link: CVE-2026-95503

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-22T08:16:43.200

Modified: 2026-09-22T15:17:25.670

Link: CVE-2026-95503

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-22T07:23:16Z

Links: CVE-2026-95503 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-22T10:45:08Z

Weaknesses
  • CWE-347

    Improper Verification of Cryptographic Signature