Vulnerability in Red Hat Build Of Keycloak
CVE-2026-16443
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.4 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.003 (25.1th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 25th percentile — 25.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.001
Affected products
- Red Hat Build Of Keycloak
- Red Hat Build Of Keycloak 26.4 — versions 26.4-22, 26.4.14-1
- Red Hat Build Of Keycloak 26.4.14
- Red Hat Build Of Keycloak 26.6 — versions 26.6-11, 26.6.5-1
- Red Hat Build Of Keycloak 26.6.5
- Red Hat Data Grid 8
- Red Hat Jboss Enterprise Application Platform Expansion Pack
- Red Hat Single Sign-On 7
- Red Hat Build Of Keycloak
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-16443 (vdb-entry, Vendor Advisory)
- RHBZ#2503139 (issue-tracking, Issue Tracking, Vendor Advisory)
- RHSA-2026:50846 (vendor-advisory, Vendor Advisory)
- RHSA-2026:50847 (vendor-advisory, Vendor Advisory)
- RHSA-2026:50848 (vendor-advisory, Vendor Advisory)
- RHSA-2026:50849 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-16443?
- CVE-2026-16443 is a high-severity vulnerability in Red Hat Build Of Keycloak, classified under Improper Verification of Cryptographic Signature. CVSS score: 7.4/10. Published 2026-08-05.
- How severe is CVE-2026-16443?
- High severity. CVSS v3 base score is 7.4 out of 10.