GitHub Advisoryadvisory · Maven
GHSA-22rm-wp4x-v5cx Keycloak Server-Side Request Forgery via OIDC token endpoint manipulation
LOW
Official page ↗
- Aliases
- CVE-2026-4874
- Ecosystem
- Maven
- Packages
- org.keycloak:keycloak-services
- Severity
- Low
- CVSS vector
- CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
- Weaknesses
- CWE-918
- Reviewed
- 2026-03-27
Affected packages
• Maven org.keycloak:keycloak-services: >= 26.5.0, < 26.6.3 → fixed in 26.6.3
• Maven org.keycloak:keycloak-services: < 26.4.13 → fixed in 26.4.13
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.
Related
Alias · CVE (1)
- CVE-2026-4874 A flaw was found in Keycloak. vulnerability
Weakness · CWE (1)
- CWE-918 Server-Side Request Forgery weakness
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