CVE-2026-4874

A flaw was found in Keycloak. An authenticated attacker can perform Server-Side Request Forgery (SSRF) by manipulating the `client_session_host` parameter during refresh token requests. This occurs when a Keycloak client is configured to use the `backchannel.logout.url` with the `application.session.host` placeholder. Successful exploitation allows the attacker to make HTTP requests from the Keycloak server’s network context, potentially probing internal networks or internal APIs, leading to information disclosure.

CVSS v3 3.1 LOW

3.1^/10

CVSS v3 : LOW

Vector :

Exploitability : 1.6 / Impact : 1.4

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required LOW

User Interaction NONE

Confidentiality Impact LOW

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://access.redhat.com/errata/RHSA-2026:25097
https://access.redhat.com/errata/RHSA-2026:25098
https://access.redhat.com/errata/RHSA-2026:30049
https://access.redhat.com/errata/RHSA-2026:30050
https://access.redhat.com/security/cve/CVE-2026-4874	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2451611	Issue Tracking Vendor Advisory

Configurations

Configuration 1 (hide)

OR	cpe:2.3:a:redhat:build_of_keycloak:-::::-:::
	cpe:2.3:a:redhat:jboss_enterprise_application_platform:8.0.0:::::::*
	cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:::::::*
	cpe:2.3:a:redhat:single_sign-on:7.0:::::::*

History

No history.

Information

Published : 2026-03-26 08:16

Updated : 2026-06-26 08:16

NVD link : CVE-2026-4874

Mitre link : CVE-2026-4874

CVE.ORG link : CVE-2026-4874

JSON object : View

Products Affected

redhat

build_of_keycloak
jboss_enterprise_application_platform_expansion_pack
single_sign-on
jboss_enterprise_application_platform

CWE

CWE-918

Server-Side Request Forgery (SSRF)

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An authenticated attacker can perform Server-Side Request Forgery (SSRF) by manipulating the `client_session_host` parameter during refresh token requests. This occurs when a Keycloak client is configured to use the `backchannel.logout.url` with the `application.session.host` placeholder. Successful exploitation allows the attacker to make HTTP requests from the Keycloak server\u2019s network context, potentially probing internal networks or internal APIs, leading to information disclosure."}, {"lang": "es", "value": "Se encontr\u00f3 una vulnerabilidad en Keycloak. Un atacante autenticado puede realizar falsificaci\u00f3n de petici\u00f3n del lado del servidor (SSRF) manipulando el par\u00e1metro 'client_session_host' durante las peticiones de token de actualizaci\u00f3n. Esto ocurre cuando un cliente de Keycloak est\u00e1 configurado para usar la 'backchannel.logout.url' con el marcador de posici\u00f3n 'application.session.host'. La explotaci\u00f3n exitosa permite al atacante realizar peticiones HTTP desde el contexto de red del servidor de Keycloak, potencialmente sondeando redes internas o APIs internas, lo que lleva a la revelaci\u00f3n de informaci\u00f3n."}], "lastModified": "2026-06-26T08:16:23.963", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:redhat:build_of_keycloak:-:*:*:*:-:*:*:*", "vulnerable": true, "matchCriteriaId": "E5C930CB-4EAD-497B-A44B-D880F2A1F85B"}, {"criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform:8.0.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0D8BC03A-4198-4488-946B-3F6B43962942"}, {"criteria": "cpe:2.3:a:redhat:jboss_enterprise_application_platform_expansion_pack:-:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "0A24CBFB-4900-47A5-88D2-A44C929603DC"}, {"criteria": "cpe:2.3:a:redhat:single_sign-on:7.0:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "9EFEC7CA-8DDA-48A6-A7B6-1F1D14792890"}], "operator": "OR"}]}], "sourceIdentifier": "secalert@redhat.com"}