CVE-2026-9794

A flaw was found in Keycloak. A remote, unauthenticated attacker can exploit this vulnerability by sending specially crafted SOAP requests to the SAML ECP (Security Assertion Markup Language Enhanced Client or Proxy) endpoint with varying client IDs. By observing distinct faultstrings in the responses, the attacker can determine the client's protocol type, leading to information disclosure.

CVSS v3 5.3 MEDIUM

5.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 3.9 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

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-2026-9794	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2482461	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 un fallo en Keycloak. Un atacante remoto no autenticado puede explotar esta vulnerabilidad enviando solicitudes SOAP especialmente diseñadas al endpoint SAML ECP (Security Assertion Markup Language Enhanced Client or Proxy) con IDs de cliente variables. Al observar faultstrings distintos en las respuestas, el atacante puede determinar el tipo de protocolo del cliente, lo que lleva a la revelación de información.

Information

Published : 2026-05-28 05:16

Updated : 2026-10-26 12:10

NVD link : CVE-2026-9794

Mitre link : CVE-2026-9794

CVE.ORG link : CVE-2026-9794

JSON object : View

Products Affected

redhat

build_of_keycloak

CWE

CWE-209

Generation of Error Message Containing Sensitive Information

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Al observar faultstrings distintos en las respuestas, el atacante puede determinar el tipo de protocolo del cliente, lo que lleva a la revelaci\u00f3n de informaci\u00f3n."}], "lastModified": "2026-10-26T12:10:00.130", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "E5C930CB-4EAD-497B-A44B-D880F2A1F85B"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}