CVE-2026-4874

LOW

3.1

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.

CVE Details

CVSS v3.1 Score3.1

SeverityLOW

CVSS VectorCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack VectorNETWORK

ComplexityHIGH

Privileges RequiredLOW

User InteractionNONE

Published3/26/2026

Last Modified4/1/2026

Sourcenvd

Honeypot Sightings0

Affected Products

redhat:build_of_keycloakredhat:jboss_enterprise_application_platformredhat:jboss_enterprise_application_platform_expansion_packredhat:single_sign-on

Weaknesses (CWE)

CWE-918

References

https://access.redhat.com/security/cve/CVE-2026-4874(secalert@redhat.com)

https://bugzilla.redhat.com/show_bug.cgi?id=2451611(secalert@redhat.com)

IOC Correlations

No correlations recorded

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