CVE-2026-16443CWE-347

CVE-2026-16443

High · published August 5, 2026

CVSS v3.1
7.4
EPSS
0%
Percentile
16.1
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.4 · HIGH
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
CVSS v4.0
Not supplied
EPSS
0.00255 · 16.1th percentile
Weakness
CWE-347 · Improper Verification of Cryptographic Signature
Published
2026-08-05T18:17Z
Affected products (2)
ProductVersionsFixed in
redhat/build_of_keycloak≥ 26.4, < 26.4.1426.4.14
redhat/build_of_keycloak≥ 26.6, < 26.6.526.6.5
References (6)
https://access.redhat.com/errata/RHSA-2026:50846 · [email protected]https://access.redhat.com/errata/RHSA-2026:50847 · [email protected]https://access.redhat.com/errata/RHSA-2026:50848 · [email protected]https://access.redhat.com/errata/RHSA-2026:50849 · [email protected]https://access.redhat.com/security/cve/CVE-2026-16443 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2503139 · [email protected]
EPSS history
Timeline
  • 05 AUG 13:44Z
    Keycloak-services: keycloak-services: saml broker metadata import disables response signature validation
    cvelistv5