CVE-2026-4874 Details
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.
A server-side request forgery (SSRF) vulnerability has been identified in Keycloak. This flaw allows an authenticated attacker to manipulate the 'client_session_host' parameter during refresh token requests. The vulnerability arises when a Keycloak client is set to use the 'backchannel.logout.url' with the 'application.session.host' placeholder. Exploitation of this vulnerability enables the attacker to send HTTP requests from the Keycloak server's network context, potentially accessing internal networks, cloud metadata services, or private APIs, leading to unauthorized information disclosure.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 26, 2026References to Advisories, Solutions, and Tools
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Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-918 | Server-Side Request Forgery (SSRF) | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| redhat build of keycloak | All versions |
CPE
Remediation
| |
| redhat jboss enterprise application platform | 8.0.0 |
CPE
Remediation
| |
| redhat jboss enterprise application platform expansion pack | All versions |
CPE
Remediation
| |
| redhat single sign-on | 7.0 |
CPE
Remediation
| |
Change History
9 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 26, 2026 | CVE Modified | [email protected] |
| Jun 26, 2026 | CVE Modified | [email protected] |
| Jun 26, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 10, 2026 | CVE Modified | [email protected] |
| Jun 10, 2026 | CVE Modified | [email protected] |
| Apr 1, 2026 | Initial Analysis | [email protected] |
| Mar 26, 2026 | New CVE Received | [email protected] |