CVE-2026-16442CWE-346

CVE-2026-16442

High · published August 5, 2026

CVSS v3.1
7.4
EPSS
0%
Percentile
23.0
In the wild
Unconfirmed
What it is

A flaw was found in the SAML broker component of Keycloak, which is used to manage identity federation and user authentication. The issue occurs because the IdP-initiated Single Sign-On endpoint fails to check if a provider is restricted to account linking only. This allows an attacker with control over a linked upstream identity to bypass login restrictions and gain full access to a local user account.

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
0.00313 · 23.0th percentile
Weakness
CWE-346 · Origin Validation Error
Published
2026-08-05T20:16Z
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-2026-16442 · [email protected]https://bugzilla.redhat.com/show_bug.cgi?id=2503138 · [email protected]
EPSS history
Timeline
  • 05 AUG 15:00Z
    Keycloak-services: keycloak-services: saml idp-initiated broker login bypasses link-only restriction
    cvelistv5