Security Flaw in Keycloak's CIBA Feature Affects Internal Service Requests
CVE-2026-1518

2.7LOW

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Keycloak
Vendor
CVE Published:
2 February 2026

What is CVE-2026-1518?

A flaw was identified in Keycloak’s Client Initiated Backchannel Authentication (CIBA) feature, where inadequate validation of client-configured backchannel notification endpoints could potentially permit unauthorized server-side requests to internal services. This could expose sensitive data or lead to further exploitation within the system.

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References

https://access.redhat.com/security/cve/CVE-2026-1518
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2433727
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
2.7
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Patrick Smith for reporting this issue.
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