CVE-2026-4874

LOW

Org.keycloak.protocol.oidc.grants: org.keycloak.services.managers: keycloak: server-side request forgery via oidc token endpoint manipulation

Title source: cna
STIX 2.1

Description

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.

References (4)

Core 4
Core References
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:25097
https://access.redhat.com/errata/RHSA-2026:25097
Vendor Advisory vendor-advisory x_refsource_redhat
RHSA-2026:25098
https://access.redhat.com/errata/RHSA-2026:25098
Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-4874
Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat
RHBZ#2451611
https://bugzilla.redhat.com/show_bug.cgi?id=2451611

Scores

CVSS v3 3.1
EPSS 0.0025
EPSS Percentile 16.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-918
Status published
Products (12)
org.keycloak/keycloak-services 0Maven
Red Hat/Red Hat Build of Keycloak
Red Hat/Red Hat build of Keycloak 26.6 26.6-6
Red Hat/Red Hat build of Keycloak 26.6 26.6.3-3
Red Hat/Red Hat build of Keycloak 26.6.3
Red Hat/Red Hat JBoss Enterprise Application Platform 8
Red Hat/Red Hat JBoss Enterprise Application Platform Expansion Pack
Red Hat/Red Hat Single Sign-On 7
redhat/build_of_keycloak
redhat/jboss_enterprise_application_platform 8.0.0
... and 2 more
Published Mar 26, 2026
Tracked Since Mar 26, 2026