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.

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Workaround

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

History

Thu, 28 May 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 28 May 2026 12:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

threat_severity

Moderate


Thu, 28 May 2026 04:45:00 +0000

Type Values Removed Values Added
Description 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.
Title Keycloak: keycloak: information disclosure via saml ecp endpoint
First Time appeared Redhat
Redhat build Keycloak
Weaknesses CWE-209
CPEs cpe:/a:redhat:build_keycloak:
Vendors & Products Redhat
Redhat build Keycloak
References
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-05-28T13:00:57.976Z

Reserved: 2026-05-28T03:15:11.408Z

Link: CVE-2026-9794

cve-icon Vulnrichment

Updated: 2026-05-28T13:00:53.570Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-05-28T05:16:40.847

Modified: 2026-05-28T13:44:54.327

Link: CVE-2026-9794

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-05-28T03:15:43Z

Links: CVE-2026-9794 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-05-28T06:15:10Z

Weaknesses