CVE-2026-9794

Keycloak: keycloak: information disclosure via saml ecp endpoint

MEDIUM
5.3
CVSS Score
Published: May 28, 2026 at 03:44 AM UTC
Updated: October 26, 2026 at 12:10 PM UTC
1 product affected across 1 vendorBuild of Keycloak

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Severity
MEDIUM5.3
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

All versions26.4
Vendor states this is fixed in 26.4-19 (unaffected)
Vendor states this is fixed in 26.4.13 (unaffected)
Vendor states this is fixed in 26.4.13-1 (unaffected)
Vendor states this is fixed in 26.6-6 (unaffected)
Vendor states this is fixed in 26.6.3 (unaffected)
Vendor states this is fixed in 26.6.3-3 (unaffected)

References (6)

VDB Entryx_refsource_REDHATVendor Advisory
Source: cverecord
https://access.redhat.com/security/cve/CVE-2026-9794
Issue Trackingx_refsource_REDHATVendor Advisory
Source: cverecord
https://bugzilla.redhat.com/show_bug.cgi?id=2482461
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:25098
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:25097
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:30049
Vendor Advisoryx_refsource_REDHAT
Source: cverecord
https://access.redhat.com/errata/RHSA-2026:30050

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

5.3MEDIUMredhat
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-209

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