CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се по мрежата, при специфични условия, без вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
A flaw was found in Keycloak. A remote attacker can exploit a Cross-Origin Resource Sharing (CORS) header injection vulnerability in Keycloak's User-Managed Access (UMA) token endpoint. This flaw occurs because the `azp` claim from a client-supplied JSON Web Token (JWT) is used to set the `Access-Control-Allow-Origin` header before the JWT signature is validated. When a specially crafted JWT with an attacker-controlled `azp` value is processed, this value is reflected as the CORS origin, even if the grant is later rejected. This can lead to the exposure of low-sensitivity information from authorization server error responses, weakening origin isolation, but only when a target client is misconfigured with `webOrigins: ["*"]`.
Засегнати продукти
- Red Hat Red Hat build of Keycloak 26.4: от 26.4.13-1 нататък
- Red Hat Red Hat build of Keycloak 26.4: от 26.4-19 нататък
- Red Hat Red Hat build of Keycloak 26.4: от 26.4-19 нататък
- Red Hat Red Hat build of Keycloak 26.4.13
- Red Hat Red Hat build of Keycloak 26.6: от 26.6.3-3 нататък
- Red Hat Red Hat build of Keycloak 26.6: от 26.6-6 нататък
- Red Hat Red Hat build of Keycloak 26.6: от 26.6-6 нататък
- Red Hat Red Hat build of Keycloak 26.6.3
Вид слабост
История
- 6 април 2026 Публикувано
Други уязвимости в Red Hat Red Hat build of Keycloak 26.4
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-37977
- https://nvd.nist.gov/vuln/detail/CVE-2026-37977
- 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-2026-37977
- https://bugzilla.redhat.com/show_bug.cgi?id=2455324