GHSA-22rm-wp4x-v5cx
Keycloak Server-Side Request Forgery via OIDC token endpoint manipulation
At a glance
- Published
- Updated
- CVE
- CVE-2026-4874
- CVSS_V3
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
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.
Affected packages
| Package | Versions |
|---|---|
| Maven · org.keycloak:keycloak-services | introduced 26.5.0, fixed 26.6.3 |
| Maven · org.keycloak:keycloak-services | introduced 0, fixed 26.4.13 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-4874 ADVISORY
- https://github.com/keycloak/keycloak/issues/47935 WEB
- https://github.com/keycloak/keycloak/pull/49682 WEB
- https://github.com/keycloak/keycloak/pull/49685 WEB
- https://github.com/keycloak/keycloak/commit/00dd0dd716c4319d3bac3eb2f2ac22d2a94f79fd WEB
- https://github.com/keycloak/keycloak/commit/63de0efd351a7a684212a042a12271908f63f0ee WEB
- https://access.redhat.com/errata/RHSA-2026:25097 WEB
- https://access.redhat.com/errata/RHSA-2026:25098 WEB
- https://access.redhat.com/errata/RHSA-2026:30049 WEB
- https://access.redhat.com/errata/RHSA-2026:30050 WEB
- https://access.redhat.com/security/cve/CVE-2026-4874 WEB
- https://bugzilla.redhat.com/show_bug.cgi?id=2451611 WEB
- https://github.com/keycloak/keycloak PACKAGE
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |