What is CVE-2026-18967?

CVE-2026-18967 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Authentication Bypass by Capture-replay. CVSS score: 6.4/10. Published 2026-08-06.

How severe is CVE-2026-18967?

Medium severity. CVSS v3 base score is 6.4 out of 10.

Vulnerability in Red Hat Build Of Keycloak

CVE-2026-18967

A flaw was found in the SAML broker component of Keycloak, an identity and access management solution. When configured as a SAML broker using the IdP-Initiated flow, Keycloak fails to enforce the OneTimeUse condition in SAML assertions. Th…

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:A/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N.

Affected products

Red Hat Build Of Keycloak
Red Hat Jboss Enterprise Application Platform Expansion Pack
Red Hat Single Sign-on 7

Weakness classification (CWE)

CWE-294 — Authentication Bypass by Capture-replay

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)

Frequently asked questions

What is CVE-2026-18967?: CVE-2026-18967 is a medium-severity vulnerability in Red Hat Build Of Keycloak, classified under Authentication Bypass by Capture-replay. CVSS score: 6.4/10. Published 2026-08-06.
How severe is CVE-2026-18967?: Medium severity. CVSS v3 base score is 6.4 out of 10.