CVE-2026-4874

LOW 3.1

Org.keycloak.protocol.oidc.grants: org.keycloak.services.managers: keycloak: server-side request forgery via oidc token endpoint manipulation

CVSS Score

3.1

EPSS Score

0.3%

EPSS Percentile

19th

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.

CWE	CWE-918
Vendor	red hat
Product	red hat build of keycloak 26.4
Published	Mar 26, 2026
Last Updated	Jun 26, 2026

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CVSS v3 Breakdown

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

Affected Versions

Red Hat / Red Hat build of Keycloak 26.4

All versions affected

Red Hat / Red Hat build of Keycloak 26.4

All versions affected

Red Hat / Red Hat build of Keycloak 26.4

All versions affected

Red Hat / Red Hat build of Keycloak 26.4.13

All versions affected

Red Hat / Red Hat build of Keycloak 26.6

All versions affected

Red Hat / Red Hat build of Keycloak 26.6

All versions affected

Red Hat / Red Hat build of Keycloak 26.6

All versions affected

Red Hat / Red Hat build of Keycloak 26.6.3

All versions affected

Red Hat / Red Hat Build of Keycloak

All versions affected

Red Hat / Red Hat Build of Keycloak

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform 8

All versions affected

Red Hat / Red Hat JBoss Enterprise Application Platform Expansion Pack

All versions affected

Red Hat / Red Hat Single Sign-On 7

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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/errata/RHSA-2026:30049 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:30050 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-4874 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2451611

Credits

Red Hat would like to thank Evan Hendra (Independent Security Researcher) for reporting this issue.