CVE-2026-7507
Full vulnerability record from the local CVENow database.
Description
A session fixation vulnerability was found in Keycloak's login-actions endpoints. An unauthenticated attacker could exploit this flaw by pre-creating an authentication session and tricking a victim into visiting a maliciously crafted link. By leveraging the /login-actions/restart endpoint—which processes session handles without adequate CSRF protection or cookie ownership validation—an attacker can reset the authentication flow state. This causes Single Sign-On (SSO) to authenticate the victim transparently upon clicking the link, allowing the attacker to hijack the required-action form without needing the victim's credentials. A successful exploit could lead to complete account takeover, including highly privileged administrative accounts.
Severity
HIGH
CVSS score
7.5
(v3.1)
Vulnerability status
Modified
Source identifier
Published
2026-05-19 12:16:19.687000
Last modified
2026-10-26 13:10:00.140000
View original CVE JSON
{
"id": "CVE-2026-7507",
"sourceIdentifier": "[email protected]",
"published": "2026-05-19T12:16:19.687",
"lastModified": "2026-10-26T13:10:00.140",
"vulnStatus": "Modified",
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"value": "A session fixation vulnerability was found in Keycloak's login-actions endpoints. An unauthenticated attacker could exploit this flaw by pre-creating an authentication session and tricking a victim into visiting a maliciously crafted link. By leveraging the /login-actions/restart endpoint—which processes session handles without adequate CSRF protection or cookie ownership validation—an attacker can reset the authentication flow state. This causes Single Sign-On (SSO) to authenticate the victim transparently upon clicking the link, allowing the attacker to hijack the required-action form without needing the victim's credentials. A successful exploit could lead to complete account takeover, including highly privileged administrative accounts."
},
{
"lang": "es",
"value": "Una vulnerabilidad de fijación de sesión fue encontrada en los endpoints login-actions de Keycloak. Un atacante no autenticado podría explotar esta falla precreando una sesión de autenticación y engañando a una víctima para que visite un enlace creado maliciosamente. Al aprovechar el endpoint /login-actions/restart -que procesa identificadores de sesión sin protección CSRF adecuada o validación de propiedad de cookie- un atacante puede restablecer el estado del flujo de autenticación. Esto hace que el Single Sign-On (SSO) autentique a la víctima de forma transparente al hacer clic en el enlace, permitiendo al atacante secuestrar el formulario de acción requerida sin necesidad de las credenciales de la víctima. Un exploit exitoso podría llevar a una toma de control completa de la cuenta, incluyendo cuentas administrativas altamente privilegiadas."
}
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