Session Hijacking Vulnerability in Keycloak by Red Hat
CVE-2026-107124

6.4MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Build Of Keycloak
Red Hat Single Sign-on 7
Vendor
CVE Published:
6 November 2026

What is CVE-2026-107124?

A vulnerability exists in the OIDC logout endpoint of the keycloak-services component within Red Hat Build of Keycloak. This flaw arises when the system sets a session cookie based on an unvalidated token hint before performing essential security checks. An exploit of this vulnerability could permit an attacker to fix a session ID in a victim's browser, effectively allowing them to hijack the victim's login session and gain comprehensive control over their account, posing severe security risks to users.

References

https://access.redhat.com/security/cve/CVE-2026-107124
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2547298
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
6.4
Severity:
MEDIUM
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
Required
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Adam Korczynski (Ada Logics Ltd) and Anthropic for reporting this issue.
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