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High severity · published Aug 2, 2026
CVE-2026-18571
Keycloak-services: keycloak-services: fgap v2 group assignment bypass during user creation
7.2
CVSS
0.5%
EPSS
No
On KEV
Description
A flaw was found in the user creation component of Keycloak when Fine-Grained Admin Permissions V2 (FGAP V2) is enabled. This issue allows a sub-administrator with permission to create users to add those users to any group, even groups the sub-administrator is not authorized to manage. This could lead to unauthorized access to sensitive information or elevated privileges for the newly created users.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 46% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
RH
Red Hat build of Keycloak 26.6 · Red Hat
All versions, or not specified · source: vendor
BO
Build OF Keycloak · Redhat
All versions, or not specified · source: NVD
Affected product
RH
Red Hat build of Keycloak 26.6
Red Hat
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-18571
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-18571
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:68277
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:68278
Vendor Advisory
https://access.redhat.com/security/cve/CVE-2026-18571
Issue Tracking
https://bugzilla.redhat.com/show_bug.cgi?id=2509759
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