CVE-2026-9800: fallo de gravedad alta en Red Hat build of Keycloak 26.4
Keycloak-policy-enforcer: keycloak policy enforcer: authorization bypass via incorrect uri comparison
Publicada el · Actualizada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 8.1epss 0.7%
A flaw was found in Keycloak Policy Enforcer. This vulnerability allows any authenticated user to bypass all authorization policies, including role, scope, and User-Managed Access (UMA) permission checks. By including the configured access-denied page path within a request URL, either as a path segment or a query parameter, an attacker can gain unauthorized access to protected resources.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Productos afectados
Red Hat · Red Hat build of Keycloak 26.4Red Hat · Red Hat build of Keycloak 26.4.13Red Hat · Red Hat build of Keycloak 26.4.14Red Hat · Red Hat build of Keycloak 26.6Red Hat · Red Hat build of Keycloak 26.6.4Red Hat · Red Hat build of QuarkusRed Hat · Red Hat build of Quarkus 3.27.4.SP2Red Hat · Red Hat build of Quarkus 3.33.2.SP2Red Hat · Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat · Red Hat Single Sign-On 7CVEs relacionadas — Red Hat build of Keycloak 26.4
En el mismo producto, de las más peligrosas a las menos.
CVE-2026-18963CRITICALKeycloak-services: keycloak-services: unauthenticated account takeover via reset-credentials flow bypassEPSS 6.6%CVE-2026-93567HIGHIo.netty/netty-codec-http2: http/1 authority-form connect is translated to malformed http/2 connect with host-controlled :authorityEPSS 2.9%CVE-2026-93569HIGHIo.netty/netty-codec-http2: http/1 absolute-form host mismatch is translated to http/2 :authority, overriding the request-target authorityEPSS 2.4%CVE-2026-93574MEDIUMIo.netty/netty-codec-http: netty: http request smuggling via post-digit whitespace in chunk-size parsingEPSS 1.7%CVE-2026-93558HIGHIo.netty/netty-codec-http: netty: unbounded per-connection queue growth in websocketserverextensionhandler leads to denial of serviceEPSS 1.2%CVE-2026-93579MEDIUMIo.netty/netty-codec-http2: netty: http/2 header field values are not validated by default (cr/lf/nul passthrough)EPSS 1.1%
Referencias
https://access.redhat.com/errata/RHSA-2026:30049https://access.redhat.com/errata/RHSA-2026:30050https://access.redhat.com/errata/RHSA-2026:30083https://access.redhat.com/errata/RHSA-2026:30084https://access.redhat.com/errata/RHSA-2026:36002https://access.redhat.com/errata/RHSA-2026:36013https://access.redhat.com/errata/RHSA-2026:50846https://access.redhat.com/errata/RHSA-2026:50847https://access.redhat.com/security/cve/CVE-2026-9800https://bugzilla.redhat.com/show_bug.cgi?id=2482472https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-9800.json