CVE-2026-16102

Summary

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.

Affected Software

VendorProductVersion RangeStatus
Red HatRed Hat build of Keycloak 26.426.4.14-1 < *unaffected
Red HatRed Hat build of Keycloak 26.426.4-22 < *unaffected
Red HatRed Hat build of Keycloak 26.426.4-22 < *unaffected
Red HatRed Hat build of Keycloak 26.626.6.5-1 < *unaffected
Red HatRed Hat build of Keycloak 26.626.6-11 < *unaffected
Red HatRed Hat build of Keycloak 26.626.6-11 < *unaffected

Weaknesses

Workarounds

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: total

References