SAML Brokering Flaw in Keycloak Affects Session Validity
CVE-2026-1190

3.1LOW

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Keycloak
Red Hat Jboss Enterprise Application Platform 8
Red Hat Jboss Enterprise Application Platform Expansion Pack
Red Hat Single Sign-on 7
Vendor
CVE Published:
26 January 2026

What is CVE-2026-1190?

A vulnerability exists in Keycloak's handling of Security Assertion Markup Language (SAML) responses. Specifically, when configured as a SAML client, Keycloak does not properly validate the 'NotOnOrAfter' timestamp in the 'SubjectConfirmationData'. This oversight potentially enables attackers to manipulate the lifespan of SAML assertions, prolonging session validity and causing unintended resource usage or extended access to applications. Organizations utilizing Keycloak for SAML-based authentication should evaluate their configurations and ensure robust session management practices.

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References

https://access.redhat.com/security/cve/CVE-2026-1190
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2430835
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
3.1
Severity:
LOW
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Franz Bettag (Bettag Systems) for reporting this issue.
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