CVE-2026-4874

3.1 LOW

A flaw was found in Keycloak

Published: 2026-03-26 · Last updated: 2026-06-10

Severity and scoring

CVSS: 3.1 LOW
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE: CWE-918

Affected products

Vendor	Product
redhat	build_of_keycloak, jboss_enterprise_application_platform, jboss_enterprise_application_platform_expansion_pack

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.

Source: NVD

References

[NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-4874
[Other]https://access.redhat.com/errata/RHSA-2026:25097
[Other]https://access.redhat.com/errata/RHSA-2026:25098
[Vendor advisory]https://access.redhat.com/security/cve/CVE-2026-4874
[Vendor advisory]https://bugzilla.redhat.com/show_bug.cgi?id=2451611

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