Description
A flaw was found in the Keycloak Admin CLI kcadm tool, which is used by administrators to manage Keycloak servers from the command line. When a custom truststore is provided to verify the server identity, the tool incorrectly accepts any self-signed certificate as long as the hostname matches. This allows a network attacker to impersonate the Keycloak server, steal administrative credentials, and perform unauthorized management actions.
Published: 2026-11-05
Score: 8 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

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. --- CME Mitigation Guidance (2026-11-06) --- Disclaimer: The following mitigation solutions are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from https://cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. The highest-value action is to disable TrustSelfSignedStrategy in the Keycloak Admin CLI HTTP client configuration and enforce validation strictly against the configured custom truststore: upgrade to Red Hat build of Keycloak 26.4.17 / 26.6.8 (or the corresponding fixed Red Hat builds), which disable TrustSelfSignedStrategy in the HTTP client and enforce certificate verification against the provided truststore, closing all 2 injection vectors (Man-in-the-Middle network interception, DNS redirection). Until patched, this is a concern on Administrators executing kcadm with a custom truststore option, so Avoid executing kcadm with custom truststores across untrusted networks, and restrict network paths and DNS resolution between client hosts and Keycloak endpoints. As a compensating measure, Cryptographically verify DNS response authenticity using DNSSEC validation to prevent DNS redirection to unauthorized servers and Isolate administrative traffic between kcadm clients and Keycloak servers into dedicated VLANs or subnets to prevent network interception. These controls limit blast radius and contain exploitation, but they do not fix the underlying certificate validation defect — apply the upstream patch to fully remediate. Highest-impact CME: CME-203 Network Segmentation (VLANs/Subnets) (medium)

Tracking

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Advisories

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History

Fri, 06 Nov 2026 17:15:00 +0000


Fri, 06 Nov 2026 10:30:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:build_keycloak: cpe:/a:redhat:build_keycloak:26.4::el9
cpe:/a:redhat:build_keycloak:26.6::el9
References

Fri, 06 Nov 2026 00:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Important


Thu, 05 Nov 2026 17:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in the Keycloak Admin CLI kcadm tool, which is used by administrators to manage Keycloak servers from the command line. When a custom truststore is provided to verify the server identity, the tool incorrectly accepts any self-signed certificate as long as the hostname matches. This allows a network attacker to impersonate the Keycloak server, steal administrative credentials, and perform unauthorized management actions.
Title Org.keycloak/keycloak-admin-cli: keycloak-admin-cli: kcadm custom truststore accepts arbitrary self-signed certificates
First Time appeared Redhat
Redhat amq Broker
Redhat build Keycloak
Redhat jboss Enterprise Application Platform
Redhat jboss Fuse
Redhat jbosseapxp
Redhat red Hat Single Sign On
Redhat satellite
Weaknesses CWE-295
CPEs cpe:/a:redhat:amq_broker:7
cpe:/a:redhat:build_keycloak:
cpe:/a:redhat:jboss_enterprise_application_platform:7
cpe:/a:redhat:jboss_enterprise_application_platform:8
cpe:/a:redhat:jboss_fuse:7
cpe:/a:redhat:jbosseapxp
cpe:/a:redhat:red_hat_single_sign_on:7
cpe:/a:redhat:satellite:6
Vendors & Products Redhat
Redhat amq Broker
Redhat build Keycloak
Redhat jboss Enterprise Application Platform
Redhat jboss Fuse
Redhat jbosseapxp
Redhat red Hat Single Sign On
Redhat satellite
References
Metrics cvssV3_1

{'score': 8, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N'}


Subscriptions

Redhat Amq Broker Build Keycloak Jboss Enterprise Application Platform Jboss Fuse Jbosseapxp Red Hat Single Sign On Satellite
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-11-06T19:44:42.948Z

Reserved: 2026-09-23T09:49:58.146Z

Link: CVE-2026-96453

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-11-05T18:17:11.270

Modified: 2026-11-06T17:20:05.820

Link: CVE-2026-96453

cve-icon Redhat

Severity : Important

Publid Date: 2026-11-05T00:00:00Z

Links: CVE-2026-96453 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-11-05T20:00:09Z

Weaknesses