PT-2026-52592 · Red Hat · Red Hat Build Of Keycloak+5

Publicado 2026-06-25 · Atualizado 2026-06-25 · CVE-2026-11800

Mitre

CVSS v3.1

8.1

Alta

Vetor base

AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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.

Correção

Improper Verification of Cryptographic Signature

Enumeração de Fraquezas

CWE-347

Identificadores relacionados

CVE-2026-11800

Produtos afetados

Red Hat Build Of Keycloak

Red Hat Data Grid 8

Red Hat Jboss Enterprise Application Platform Expansion Pack

Red Hat Single Sign-On 7

Red Hat Build Of Keycloak 26.6

Red Hat Build Of Keycloak 26.6.4

Referências · 5

• https://access.redhat.com/errata/RHSA-2026:30084 · Aviso do Fabricante
• https://access.redhat.com/errata/RHSA-2026:30083 · Aviso do Fabricante
• https://bugzilla.redhat.com/show_bug.cgi?id=2487006 · Nota
• https://nvd.nist.gov/vuln/detail/CVE-2026-11800 · Nota de Segurança
• https://access.redhat.com/security/cve/CVE-2026-11800 · Nota