CVE-2026-96453: Org.keycloak/keycloak-admin-cli: keycloak-admin-cli: kcadm custom truststore accepts arbitrary self-signed certificates

Is it exploited?

Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of 10 Nov 2026. If CISA adds it, this page shows it as known exploited.

How likely is exploitation in the next 30 days?

0.2%

EPSS score, percentile 12.7 of all scored records. A probability estimated by FIRST, not a report of exploitation.

How severe?

8.0 High

CVSS v3.1 base score, given by the CNA

What should I do?

CISA has set no required action, because the vulnerability is not in KEV.

Advisories and patches (4)

Which versions are affected?

Unaffected 26.4.17-2; 26.4-29; 26.4-30; 26.6.8-2; 26.6-24; 26.6-24

Versions by product

Source: CISA KEV 2026.11.10, as of 10 Nov 2026; FIRST EPSS, as of 12 Nov 2026; CVE List, as of 12 Nov 2026. About the data.

Description

Org.keycloak/keycloak-admin-cli: keycloak-admin-cli: kcadm custom truststore accepts arbitrary self-signed certificates

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.

Source: CVE List, as of 12 Nov 2026. About the data.

What to do

Advisories and patches

• RHSA-2026:95759 (Vendor advisory)
• RHSA-2026:95760 (Vendor advisory)
• RHSA-2026:95761 (Vendor advisory)
• RHSA-2026:95762 (Vendor advisory)

Workaround (from the CVE record)

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)

This summary is based on the CVE record as of 12 Nov 2026. Check the vendor's advisory before you act: affected versions and fixes can change.

Affected products and versions

Source: CVE List, as of 12 Nov 2026. About the data.

Timeline

Known exploited Red Hat vulnerabilities

• CVE-2015-3246: Red Hat Libuser Race Condition Vulnerability (added 26 Aug 2026)
• CVE-2015-5287: Red Hat Automatic Bug Reporting Tool Privilege Escalation Vulnerability (added 26 Aug 2026)
• CVE-2018-14667: Red Hat JBoss RichFaces Framework Expression Language Injection Vulnerability (added 28 Sep 2023)
• CVE-2021-3560: Red Hat Polkit Incorrect Authorization Vulnerability (added 12 May 2023)
• CVE-2021-4034: Red Hat Polkit Out-of-Bounds Read and Write Vulnerability (added 27 Jun 2022)