CVE-2026-16443
Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation
HIGH 7.4
At a glance
- Source
- NVD
- EPSS
- EPSS 0.32 % · percentile 25 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- redhat
- NVD status
- Analyzed
Description
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.
Weaknesses (CWE)
- CWE-347 — Improper Verification of Cryptographic Signature
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | redhat |
| CVSS 3.1 | HIGH 7.4 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N | NVD · secalert@redhat.com (Secondary) |
| CVSS 3.1 | CRITICAL 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N | NVD · nvd@nist.gov (Primary) |
European references
- ENISA EUVD · EUVD-2026-53343
- GCVE · GCVE-0-2026-16443
CERT-FR advisories
- CERTFR-2026-AVI-0976 — Multiples vulnérabilités dans KeyCloak · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*≥ 26.4 < 26.4.14cpe:2.3:a:redhat:build_of_keycloak:*:*:*:*:*:*:*:*≥ 26.6 < 26.6.5
Affected products
| Product | Versions |
|---|---|
| Red Hat · Red Hat build of Keycloak 26.4 | unaffected 26.4.14-1 < * |
| Red Hat · Red Hat build of Keycloak 26.4 | unaffected 26.4-22 < * |
| Red Hat · Red Hat build of Keycloak 26.4 | unaffected 26.4-22 < * |
| Red Hat · Red Hat build of Keycloak 26.4.14 | |
| Red Hat · Red Hat build of Keycloak 26.4.14 | |
| Red Hat · Red Hat build of Keycloak 26.6 | unaffected 26.6.5-1 < * |
| Red Hat · Red Hat build of Keycloak 26.6 | unaffected 26.6-11 < * |
| Red Hat · Red Hat build of Keycloak 26.6 | unaffected 26.6-11 < * |
| Red Hat · Red Hat build of Keycloak 26.6.5 | |
| Red Hat · Red Hat build of Keycloak 26.6.5 | |
| 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 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |