Vulnerability · Published Nov 7, 2026 · Assigned by redhat

CVE-2026-120984Keycloak-services: keycloak-services: manage-clients to arbitrary code execution through inline javascript policy import

Critical 9.1

In plain English

A critical-severity code injection in Red Hat Build of Keycloak from Red Hat. There are no confirmed reports of exploitation so far.

Severity (CVSS 3.1)9.1Critical

Exploit odds (30 days)–no EPSS score yet

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

A flaw was found in the Keycloak server's client management component. When a client is created or imported with authorization services enabled, the system fails to properly clear an internal session attribute used during the setup process. This allows an authenticated attacker with client management permissions to bypass security controls and upload a malicious JavaScript policy, which is then executed on the server when an authorization request is made. Successful exploitation could allow the attacker to run arbitrary code on the server, potentially compromising the entire system.

Affected products (as reported)

Vendor	Product	Versions
Red Hat	Red Hat Build of Keycloak	see references
Red Hat	Red Hat Build of Keycloak	see references
Red Hat	Red Hat Single Sign-On 7	see references

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

References

https://access.redhat.com/security/cve/CVE-2026-120984 vdb-entry, x_refsource_REDHAT
RHBZ#2565599 issue-tracking, x_refsource_REDHAT