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CVE-2026-4366

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

Published: Mar 18, 2026Updated: Jun 9, 2026 Sources: CVE List NVDCWE-918
NVD MITRE
5.8CVSSMEDIUM
EPSS Score
0.2%
Top 86.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:NUI:NS:CC:LI:NA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:LConfidentiality
Low
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-918

Affected Products

Red Hat build of Keycloak 26.4Red Hat
On-premWeb App
Web & CMS Plugins
Red Hat build of Keycloak 26.4.12Red Hat
On-prem
Operating Systems / linux-distro
Red Hat Build of KeycloakRed HatWeb & CMS Plugins
Red Hat JBoss Enterprise Application Platform 8Red Hat
On-premWeb App
Enterprise Software / itsm-monitoring
Red Hat JBoss Enterprise Application Platform Expansion PackRed Hat
On-premOS
Operating Systems / linux-distro
red hatcommercialUSOperating Systemsaka red hat
and 5 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Command and Control
Initial Access
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2026:19596
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:19597
access.redhat.com
https://access.redhat.com/security/cve/CVE-2026-4366
access.redhat.com
and 1 more references View all →

Timeline

Published
Mar 18, 2026
Last Updated
Jun 9, 2026

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