Vulnerability Report

CVE-2026-16102

Title: Keycloak Dynamic Client Registration allows forging administrative roles via User Property mappers

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-16102.

CWE Category NVD-CWE-noinfo

Published Date Aug 05, 2026

Modified Date Aug 31, 2026

Exploit Status Not Found

Score 8.1 CVSS v3.1

Exploit Probability (EPSS)

0.46%

Vulnerability Summary

CVE-2026-16102: 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.

Impacted Vendors

redhat 4

pivotal 1

Reference Links

https://access.redhat.com/security/cve/CVE-2026-16102 https://bugzilla.redhat.com/show_bug.cgi?id=2501735

CVSS v3.1

Source Entity [email protected]

Severity HIGH

8.1

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns