Vulnerability in Red Hat Build Of Keycloak
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (39.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 40th percentile — 39.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Red Hat Build Of Keycloak
- Red Hat Build Of Keycloak 26.4 — versions 26.4-22, 26.4.14-1
- Red Hat Build Of Keycloak 26.4.14
- Red Hat Build Of Keycloak 26.6 — versions 26.6-11, 26.6.5-1
- Red Hat Build Of Keycloak 26.6.5
- Red Hat Data Grid 8
- Red Hat Jboss Enterprise Application Platform Expansion Pack
- Red Hat Single Sign-On 7
- Red Hat Build Of Keycloak
- Red Hat Data Grid — versions 8.0
Weakness classification (CWE)
References
- access.redhat.com/security/cve/CVE-2026-16102 (vdb-entry, Vendor Advisory)
- bugzilla.redhat.com/show_bug.cgi (issue-tracking, Issue Tracking)
- access.redhat.com/errata/RHSA-2026:50846 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:50847 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:50848 (vendor-advisory, Vendor Advisory)
- access.redhat.com/errata/RHSA-2026:50849 (vendor-advisory, Vendor Advisory)
Frequently asked questions
- What is CVE-2026-16102?
- CVE-2026-16102 is a high-severity vulnerability in Red Hat Build Of Keycloak, classified under CWE-551. CVSS score: 8.1/10. Published 2026-08-05.
- How severe is CVE-2026-16102?
- High severity. CVSS v3 base score is 8.1 out of 10.