CVE-2026-4874

LOW EPSS 21.2%

Published Mar 26, 20263mo ago · Modified Jun 17, 20261w ago

3.1 CVSS 3.1

Low

Published Mar 26, 2026 3mo ago

Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score

3.1

Exploitability

1.6

Impact

1.4

Vector string

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

Attack Vector Network

Attack Complexity High

Privileges Required Low

User Interaction None

Scope Unchanged

Confidentiality Low

Integrity None

Availability None

Threat Intelligence

EPSS Exploit Probability

21.2% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-918 Server-Side Request Forgery (SSRF) Validation

Affected Products 4

Vendor	Product	Version	Range
redhat	build_of_keycloak	*	any
redhat	jboss_enterprise_application_platform	8.0.0	any
redhat	jboss_enterprise_application_platform_expansion_pack	*	any
redhat	single_sign-on	7.0	any

References 4

access.redhat.com https://access.redhat.com/errata/RHSA-2026:25097
access.redhat.com https://access.redhat.com/errata/RHSA-2026:25098
access.redhat.com https://access.redhat.com/security/cve/CVE-2026-4874

Vendor Advisory
bugzilla.redhat.com https://bugzilla.redhat.com/show_bug.cgi?id=2451611

Issue TrackingVendor Advisory

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.