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.
Metrics
CVSS 3.1 3.1/10
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:NWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Red Hat | Red Hat build of Keycloak 26.4 | — |
| Red Hat | Red Hat build of Keycloak 26.4 | — |
| Red Hat | Red Hat build of Keycloak 26.4 | — |
| Red Hat | Red Hat build of Keycloak 26.4.13 | — |
| Red Hat | Red Hat build of Keycloak 26.6 | — |
| Red Hat | Red Hat build of Keycloak 26.6 | — |
| Red Hat | Red Hat build of Keycloak 26.6 | — |
| Red Hat | Red Hat build of Keycloak 26.6.3 | — |
| Red Hat | Red Hat Build of Keycloak | — |
| Red Hat | Red Hat Build of Keycloak | — |
| 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 | — |
References
- 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-2026-4874Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2451611Issue Tracking, Vendor Advisory
Timeline
- Published
- Mar 26, 2026
- Last modified
- Jun 26, 2026
- NVD status
- Modified