NVD

CVE-2026-4366 Detail

Modified After Enrichment

This CVE record has been updated after NVD enrichment efforts were completed. Enrichment data supplied by the NVD may require amendment due to these changes.

Description

A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.

Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.

CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

Nist CVSS score does not match with CNA score

CNA: Red Hat, Inc.

Base Score: 5.8 MEDIUM

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

CVSS 2.0 Severity and Vector Strings:

National Institute of Standards and Technology

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL	Source(s)	Tag(s)
https://access.redhat.com/errata/RHSA-2026:19596	Red Hat, Inc.
https://access.redhat.com/errata/RHSA-2026:19597	Red Hat, Inc.
https://access.redhat.com/security/cve/CVE-2026-4366	Red Hat, Inc.	Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2448543	Red Hat, Inc.	Issue Tracking Vendor Advisory

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-918	Server-Side Request Forgery (SSRF)	Red Hat, Inc.

Known Affected Software Configurations Switch to CPE 2.2

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Change History

5 change records found show changes

CVE Modified by Red Hat, Inc. 6/17/2026 6:56:29 AM

Action

Type

Old Value

New Value

Added

Affected

Record truncated, showing 2048 of 2573 characters.
View Entire Change Record

[{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-operator-bundle","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"],"versions":[{"version":"26.4.12-1","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-rhel9","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"],"versions":[{"version":"26.4-17","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4","defaultStatus":"affected","collectionURL":"https://catalog.redhat.com/software/containers/","packageName":"rhbk/keycloak-rhel9-operator","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"],"versions":[{"version":"26.4-17","lessThan":"*","versionType":"rpm","status":"unaffected"}]},{"vendor":"Red Hat","product":"Red Hat build of Keycloak 26.4.12","defaultStatus":"unaffected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","cpes":["cpe:/a:redhat:build_keycloak:26.4::el9"]},{"vendor":"Red Hat","product":"Red Hat Build of Keycloak","defaultStatus":"affected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhbk/keycloak-operator-bundle","cpes":["cpe:/a:redhat:build_keycloak:"]},{"vendor":"Red Hat","product":"Red Hat Build of Keycloak","defaultStatus":"affected","collectionURL":"https://access.redhat.com/downloads/content/package-browser/","packageName":"rhbk/keycloak-rhel9-operator","cpes":["cpe:/a:redhat:build_keycloak:"]},{"vendor":"Red Hat","product":"Red Hat JBoss Enterprise Application Platform 8","defaultStatus":"affected","collectionURL":"https://access.redhat.com/jbossnetwork/restricted/listSoftware.html","packageName":"keycloak-services","cpes":["cpe:/a:redhat:jboss_enterprise_application_platform:8"]},

New CVE Received from Red Hat, Inc. 3/18/2026 12:17:32 AM

Action	Type	New Value
Added	Description	A flaw was identified in Keycloak, an identity and access management solution, where it improperly follows HTTP redirects when processing certain client configuration requests. This behavior allows an attacker to trick the server into making unintended requests to internal or restricted resources. As a result, sensitive internal services such as cloud metadata endpoints could be accessed. This issue may lead to information disclosure and enable attackers to map internal network infrastructure.
Added	CVSS V3.1	AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N
Added	CWE	CWE-918
Added	Reference	https://access.redhat.com/security/cve/CVE-2026-4366
Added	Reference	https://bugzilla.redhat.com/show_bug.cgi?id=2448543

Quick Info

CVE Dictionary Entry:
CVE-2026-4366
NVD Published Date:
03/18/2026
NVD Last Modified:
06/17/2026
Source:
Red Hat, Inc.

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Information Technology Laboratory

National Vulnerability Database