What’s Vulnerable › Vulnerabilities

CVE-2026-4366: Keycloak-services: blind server-side request forgery (ssrf) via http redirect handling in keycloak

• Severity: medium (CVSS 5.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-18 · updated 2026-06-17
• Weakness: CWE-918

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.

Affected products

• Red Hat build of Keycloak 26.4: all versions
• Red Hat JBoss EAP: 8.0.0
• RedHat Jboss Enterprise Application Platform Expansion Pack: all versions
• Red Hat Single Sign-On: 7.0

References

• 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
• https://bugzilla.redhat.com/show_bug.cgi?id=2448543

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