High 7.4Published Aug 5, 2026

CVE-2026-16443Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation

Updated under an hour ago (Oct 27, 2026, 2:10 AM ET)

Does this affect you?

It affects Red Hat build of Keycloak 26.4 and 4 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for Red Hat build of Keycloak 26.4

Exploited in the last 30 days

A flaw was found in the SAML metadata import functionality of the keycloak-services component, which is the core engine for identity brokering in Red Hat Build of Keycloak. When importing identity provider metadata that lacks specific usage attributes for keys, the system incorrectly disables signature validation for SAML responses even if a signing certificate is provided. This issue allows an unauthenticated attacker to forge a SAML response and gain unauthorized access to a user account by knowing their external identifier.

CVSS: 7.4 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness (CWE): CWE-347
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: redhat
NVD analysis: Analyzed
Record last updated: Aug 31, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Red Hat Red Hat build of Keycloak 26.4 redhat:build_keycloak	from 26.4.14-1 not affected	CNA record
Red Hat Red Hat Data Grid 8 redhat:jboss_data_grid	8	CNA record
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack redhat:jbosseapxp	Versions not stated	CNA record
Red Hat Red Hat Single Sign-On 7 redhat:red_hat_single_sign_on	7	CNA record
redhat build_of_keycloak redhat:build_of_keycloak	from 26.4 before 26.4.14; from 26.6 before 26.6.5	NVD

References

References

https://access.redhat.com/errata/RHSA-2026:50846	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:50847	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:50848	vendor-advisory, x-refsource-redhat
https://access.redhat.com/errata/RHSA-2026:50849	vendor-advisory, x-refsource-redhat
https://access.redhat.com/security/cve/CVE-2026-16443	vdb-entry, x-refsource-redhat, vendor-advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2503139	issue-tracking, x-refsource-redhat, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.