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Red Hat Keycloak CVE-2026-9794

| EUVD-2026-32709 MEDIUM
Error Message Information Leak (CWE-209)
2026-05-28 redhat GHSA-fqjh-8322-vgrv
5.3
CVSS 3.1
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CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
None

Lifecycle Timeline

1
Analysis Generated
May 28, 2026 - 05:03 vuln.today

DescriptionNVD

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.

AnalysisAI

Information disclosure in Red Hat Build of Keycloak exposes client protocol type to unauthenticated remote attackers via error message enumeration. By submitting specially crafted SOAP requests targeting the SAML ECP (Enhanced Client or Proxy) endpoint with varying client IDs, an attacker can observe distinct faultstring values in server responses and map which clients use which protocol types. …

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CVE-2026-9794 vulnerability details – vuln.today

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