VULNERABILITY INTELLIGENCE

CVE-2026-16102

CVSS score8.1 HIGH
EPSS probability0.46%
CISA KEVNot currently listed
Published2026-08-05
Last modified2026-08-31
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Description

A flaw was found in the Dynamic Client Registration (DCR) component of Keycloak, an identity and access management solution. The default DCR policy fails to properly validate the claim path for User Property mappers, allowing them to write values to sensitive internal claim locations. An attacker with a standard user account and a limited Initial Access Token can exploit this to forge administrative roles in their access token. This allows the attacker to take over other clients, steal confidential secrets, and potentially gain full administrative control over the realm.

Weakness classification

  • CWE-284: Improper Access Control
  • CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization

Primary references