What is CVE-2026-96453?

CVE-2026-96453 is a high-severity vulnerability in Red Hat Single Sign-On 7, classified under Improper Certificate Validation. CVSS score: 8.0/10. Published 2026-11-05.

How severe is CVE-2026-96453?

High severity. CVSS v3 base score is 8.0 out of 10.

Vulnerability in Red Hat Single Sign-On 7

CVE-2026-96453

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.

Vulnerability class: Improper Certificate Validation

Published 2026-11-05 · last modified 2026-11-06.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Red Hat Single Sign-On 7

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

RHSA-2026:95759 (vendor-advisory)
RHSA-2026:95760 (vendor-advisory)
RHSA-2026:95761 (vendor-advisory)
RHSA-2026:95762 (vendor-advisory)
access.redhat.com/security/cve/CVE-2026-96453 (vdb-entry)
RHBZ#2539294 (issue-tracking)

Frequently asked questions

What is CVE-2026-96453?: CVE-2026-96453 is a high-severity vulnerability in Red Hat Single Sign-On 7, classified under Improper Certificate Validation. CVSS score: 8.0/10. Published 2026-11-05.
How severe is CVE-2026-96453?: High severity. CVSS v3 base score is 8.0 out of 10.