Vulnerability Report

CVE-2026-4874

Title: Keycloak SSRF

SSRF

Proof Of Concept

No public PoC currently indexed for CVE-2026-4874.

CWE Category CWE-918

Published Date Mar 26, 2026

Modified Date Jun 26, 2026

Exploit Status Not Found

Score 3.1 CVSS v3.1

Exploit Probability (EPSS)

0.33%

Vulnerability Summary

CVE-2026-4874: 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.

Impacted Vendors

redhat 4

broadcom 1

pivotal 1

Reference Links

https://access.redhat.com/security/cve/CVE-2026-4874 https://bugzilla.redhat.com/show_bug.cgi?id=2451611

CVSS v3.1

Source Entity [email protected]

Severity LOW

3.1

Attack Vector

NETWORK

Complexity

HIGH

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N