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Vulnerability record · CVE-2026-4366 · published 18 March 2026

CVE-2026-4366: Redhat build of keycloak server-side request forgery (ssrf) vulnerability

Redhat · Build Of Keycloak

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.

5.8 CVSS 3.1 Medium EPSS 0.39% · top 69.1% CWE-918 · Server-side request forgery (SSRF)
5.8CVSS 3.1 base score
0.39%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://access.redhat.com/errata/RHSA-2026:19596
https://access.redhat.com/errata/RHSA-2026:19597
https://access.redhat.com/security/cve/CVE-2026-4366 Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2448543 Issue TrackingVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-4366), CISA KEV, FIRST EPSS (scores of 2026-10-04). This page is refreshed as NVD updates the record.