Keycloak-services: keycloak-services: default dcr policy allows role forgery via user property mappers

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.

Scores

EPSS (exploitation in 30 days)

0.46% · top 60% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.1.

Weakness

• CWE-551: Incorrect Behavior Order: Authorization Before Parsing and Canonicalization (opens in a new tab)All about CWE-551 and its CVEs
• CWE-284 Improper Access Control (opens in a new tab)All about CWE-284 and its CVEs

Affected products

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4.14-1 – < *

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4-22 – < *

• Red Hat · Red Hat build of Keycloak 26.4

  • unaffected 26.4-22 – < *

• Red Hat · Red Hat build of Keycloak 26.4.14

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.4.14

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6.5-1 – < *

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6-11 – < *

• Red Hat · Red Hat build of Keycloak 26.6

  • unaffected 26.6-11 – < *

• Red Hat · Red Hat build of Keycloak 26.6.5

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.6.5

  All versions: unaffected

• Red Hat · Red Hat build of Keycloak 26.6.5

  All versions: unaffected

• Red Hat · Red Hat Data Grid 8

  All versions: unaffected

• Red Hat · Red Hat JBoss Enterprise Application Platform Expansion Pack

  All versions: unaffected

• Red Hat · Red Hat Single Sign-On 7

  All versions: affected

What to do

Workaround: 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.

References (6)

• RHSA-2026:50846 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:50847 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:50848 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• RHSA-2026:50849 (opens in a new tab)vendor-advisoryx_refsource_REDHAT
• https://access.redhat.com/security/cve/CVE-2026-16102 (opens in a new tab)vdb-entryx_refsource_REDHAT
• RHBZ#2501735 (opens in a new tab)issue-trackingx_refsource_REDHAT

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2026-16102](https://trackcve.app/badge/CVE-2026-16102.svg)](https://trackcve.app/cve/CVE-2026-16102)

Record last updated 31 Aug 2026, 11:25 UTC.