CVE-2026-9802

A flaw was found in Keycloak. When revokeRefreshToken=true is enabled and persistent session storage is in use, a server restart can reset internal timing mechanisms. This allows a remote attacker, who has previously captured a user's refresh token, to replay that token even after it has been revoked. Successful exploitation grants the attacker unauthorized access to the victim's account, potentially leading to information disclosure or privilege escalation.

CVSS v3 6.8 MEDIUM

6.8^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.6 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:25097
https://access.redhat.com/errata/RHSA-2026:25098
https://access.redhat.com/errata/RHSA-2026:30049
https://access.redhat.com/errata/RHSA-2026:30050
https://access.redhat.com/security/cve/CVE-2026-9802	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2482467	Issue Tracking Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*

History

26 Oct 2026, 12:10

Type	Values Removed	Values Added
Summary		(es) Se encontró una vulnerabilidad en Keycloak. Cuando revokeRefreshToken=true está habilitado y el almacenamiento persistente de sesiones está en uso, un reinicio del servidor puede restablecer los mecanismos internos de temporización. Esto permite a un atacante remoto, que ha capturado previamente el token de actualización de un usuario, reutilizar ese token incluso después de haber sido revocado. La explotación exitosa otorga al atacante acceso no autorizado a la cuenta de la víctima, lo que podría conducir a la revelación de información o a la escalada de privilegios.

Information

Published : 2026-05-28 06:16

Updated : 2026-10-26 12:10

NVD link : CVE-2026-9802

Mitre link : CVE-2026-9802

CVE.ORG link : CVE-2026-9802

JSON object : View

Products Affected

redhat

build_of_keycloak

CWE

CWE-613

Insufficient Session Expiration

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