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Fencer Vulns
critical 9.1

CVE-2026-120984 json

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

published 2026-11-07 38 h ago modified 2026-11-07 38 h ago also EUVD-2026-119254

cvss
9.1
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 36%
public exploits
0
none known

Summary

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.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-120984 updated cvss 9.1

keycloak-services: keycloak-services: manage-clients to arbitrary code execution through inline JavaScript policy import

  • Red Hat Build of Keycloak rhbk/keycloak-rhel9, keycloak-services 26.4.16.redhat-00003 Red Hat Single Sign-On 7 keycloak-services 26.4.16.redhat-00003
    affected: workaround, no fix available

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.42% chance of exploitation in the next 30 days, higher than 36% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 9.1 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H

Affected products

  • Red Hat Red Hat Build of Keycloak
  • Red Hat Red Hat Single Sign-On 7

Classification

Weakness
  • CWE-94 Improper Control of Generation of Code

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.