Описание
Keycloak has authentication bypass via jwt algorithm confusion
Description
A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.
Ссылки
- https://github.com/keycloak/keycloak/security/advisories/GHSA-j97h-3f8r-mrjr
- https://nvd.nist.gov/vuln/detail/CVE-2026-11800
- https://github.com/keycloak/keycloak/issues/50357
- https://github.com/keycloak/keycloak/pull/50374
- https://github.com/keycloak/keycloak/commit/6d61885f20ac59a2ff8b823fc9ed1f1ef1019951
- https://github.com/keycloak/keycloak/commit/d343c7373dcc7bfeb9dc14de2309836299c81837
- https://access.redhat.com/errata/RHSA-2026:30083
- https://access.redhat.com/errata/RHSA-2026:30084
- https://access.redhat.com/security/cve/CVE-2026-11800
- https://bugzilla.redhat.com/show_bug.cgi?id=2487006
- https://github.com/keycloak/keycloak/releases/tag/26.6.4
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-11800.json
Пакеты
org.keycloak:keycloak-services
< 26.6.4
26.6.4
Связанные уязвимости
A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.
A flaw was found in Keycloak. This JWT algorithm confusion vulnerability in the JWT Authorization Grant flow allows an attacker with valid client credentials to bypass signature verification. By forging an assertion, the attacker can create unauthorized access tokens. This enables the attacker to impersonate any federated user linked to the affected Identity Provider, leading to unauthorized access and potential privilege escalation.
A flaw was found in Keycloak. This JWT algorithm confusion vulnerabili ...
ALT-PU-2026-10320: package `keycloak` update to version 26.6.4-alt1
ALT-PU-2026-10145: package `keycloak` update to version 26.6.4-alt1