CVE-2026-1180

MEDIUM 5.8

Org.keycloak.protocol.oidc: blind server-side request forgery (ssrf) in keycloak oidc dynamic client registration via jwks_uri

CVSS Score

5.8

EPSS Score

0.0%

EPSS Percentile

13th

A flaw was identified in Keycloak’s OpenID Connect Dynamic Client Registration feature when clients authenticate using private_key_jwt. The issue allows a client to specify an arbitrary jwks_uri, which Keycloak then retrieves without validating the destination. This enables attackers to coerce the Keycloak server into making HTTP requests to internal or restricted network resources. As a result, attackers can probe internal services and cloud metadata endpoints, creating an information disclosure and reconnaissance risk.

CWE	CWE-918
Vendor	red hat
Product	red hat build of keycloak 26.4
Published	Jan 20, 2026
Last Updated	Apr 2, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Changed

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 26.4.11

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-2026:6477 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:6478 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-1180 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2430781

Credits

Red Hat would like to thank Lucas Montes (Nirox) for reporting this issue.