Client Management Flaw in Keycloak Server by Red Hat
CVE-2026-120984

9.1CRITICAL

Key Information:

Vendor

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

What is CVE-2026-120984?

A security flaw has been identified in the client management component of Keycloak server. This issue arises when clients are created or imported with authorization services activated; the internal session attribute utilized during setup fails to be adequately cleared. An authenticated attacker, given client management permissions, can exploit this vulnerability to bypass essential security protocols and upload a malicious JavaScript policy. This uploading leads to the execution of the injected script on the server during authorization requests, causing the potential execution of arbitrary code and jeopardizing the integrity of the entire system.

References

https://access.redhat.com/security/cve/CVE-2026-120984
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2565599
issue-trackingx_refsource_REDHAT

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Nassim Abbaoui (OVHcloud) and Marcin Naskręt (UNSHADE) for reporting this issue.
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