EUVD-2026-32709
GHSA-fqjh-8322-vgrv
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Primary rating from Vendor (redhat).
CVSS VectorVendor: redhat
Lifecycle Timeline
1Blast Radius
ecosystem impact- 50 maven packages depend on org.keycloak:keycloak-services (22 direct, 28 indirect)
Ecosystem-wide dependent count for version 26.5.0.
DescriptionCVE.org
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. No authentication, user interaction, or elevated privileges are required, and the CVSS vector (AV:N/AC:L/PR:N/UI:N) confirms exploitation is straightforward against any exposed instance. No public exploit code has been identified and this CVE is not listed in the CISA KEV catalog at time of analysis.
Technical ContextAI
The affected product is Red Hat Build of Keycloak, an enterprise identity and access management solution based on the upstream Keycloak project (CPE: cpe:2.3:a:red_hat:red_hat_build_of_keycloak:*:*:*:*:*:*:*:*). The vulnerability involves the SAML ECP (Security Assertion Markup Language Enhanced Client or Proxy) endpoint, which accepts SOAP-formatted XML messages to facilitate authentication for thick clients that cannot handle HTTP redirects. The root cause is classified as CWE-209 - Generation of Error Message Containing Sensitive Information - meaning the server produces different, distinguishable faultstring error messages depending on internal state (in this case, the resolved client's protocol type). This differential error response pattern enables an oracle-style enumeration attack: an attacker iterates over client IDs and classifies each by the specific error text returned, leaking configuration data that should not be externally observable.
RemediationAI
The primary remediation is to apply the vendor-released patch per the Red Hat security advisory at https://access.redhat.com/security/cve/CVE-2026-9794; however, no exact fixed version number was included in the available input data, so administrators should consult that advisory directly to identify the target upgrade version. Until patching is possible, a practical compensating control is to restrict network access to the SAML ECP endpoint (typically /auth/realms/{realm}/protocol/saml/clients/saml-ecp or equivalent path) via WAF rules or reverse proxy ACLs, limiting access to known client IP ranges only - this does not eliminate the vulnerability but removes external attacker access to the vulnerable endpoint. If SAML ECP is not actively required for any clients, disabling the ECP profile entirely at the realm level eliminates the attack surface without functional impact to OIDC or standard SAML SP clients. Note that disabling ECP will break thick-client SAML authentication flows that rely on it.
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Same weakness CWE-209 – Error Message Information Leak
View allSame technique Information Disclosure
View allVendor StatusVendor
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External POC / Exploit Code
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