CVE-2026-9794

MEDIUM 5.3

Keycloak: keycloak: information disclosure via saml ecp endpoint

CVSS Score

5.3

EPSS Score

0.0%

EPSS Percentile

9th

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.

CWE	CWE-209
Vendor	red hat
Product	red hat build of keycloak
Published	May 28, 2026
Last Updated	May 28, 2026

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CVSS v3 Breakdown

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

Affected Versions

Red Hat / Red Hat Build of Keycloak

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-9794 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2482461

Credits

Red Hat would like to thank Asaad Mostafa and Muhammed Hussein for reporting this issue.