CVE-2026-16443
HIGHKeycloak-services: keycloak-services: saml broker metadata import disables response signature validation
Title source: cnaDescription
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.
References (6)
Core 6
Core References
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:50846
https://access.redhat.com/errata/RHSA-2026:50846
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:50847
https://access.redhat.com/errata/RHSA-2026:50847
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:50848
https://access.redhat.com/errata/RHSA-2026:50848
Vendor Advisory vendor-advisory
x_refsource_redhat
RHSA-2026:50849
https://access.redhat.com/errata/RHSA-2026:50849
Vdb Entry, X_Refsource_Redhat vdb-entry
x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-16443
Issue Tracking, X_Refsource_Redhat issue-tracking
x_refsource_redhat
RHBZ#2503139
https://bugzilla.redhat.com/show_bug.cgi?id=2503139
Scores
CVSS v3
7.4
EPSS
0.0015
EPSS Percentile
5.1%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
total
Details
CWE
CWE-347
Status
published
Products (10)
Red Hat/Red Hat build of Keycloak 26.4
26.4-22
Red Hat/Red Hat build of Keycloak 26.4
26.4.14-1
Red Hat/Red Hat build of Keycloak 26.4.14
Red Hat/Red Hat build of Keycloak 26.6
26.6-11
Red Hat/Red Hat build of Keycloak 26.6
26.6.5-1
Red Hat/Red Hat build of Keycloak 26.6.5
Red Hat/Red Hat Data Grid 8
Red Hat/Red Hat JBoss Enterprise Application Platform Expansion Pack
Red Hat/Red Hat Single Sign-On 7
redhat/build_of_keycloak
26.4 - 26.4.14
Published
Aug 05, 2026
Tracked Since
Aug 05, 2026