Severity by source
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Sub-admin credential required (PR:H), admin console exposed over network (AV:N); no availability impact is described or implied in the group-assignment attack path.
Primary rating from Vendor (redhat).
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
5DescriptionNVD
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.
AnalysisAI
Privilege escalation in Red Hat Build of Keycloak's user creation component exposes environments running Fine-Grained Admin Permissions V2 (FGAP V2) to unauthorized group assignment by scoped sub-administrators. A sub-admin holding only user-create permissions can bypass group-level authorization checks and enroll newly created users into any group - including privileged or sensitive ones - well beyond the sub-admin's delegated scope. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Fine-Grained Admin Permissions V2 (FGAP V2) must be explicitly enabled in the Keycloak realm - this is a non-default configuration that must be intentionally activated. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H) yields a 7.2 High score, but PR:H substantially narrows exploitability - the attacker must already possess an authenticated sub-administrator account with user creation rights. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker controlling a sub-administrator account with user-create permission - whether through credential theft, insider access, or social engineering - logs into the Keycloak admin console of an instance with FGAP V2 enabled. During user creation, they assign the new account to a privileged group (e.g., a finance or platform-admin group) that their sub-admin role does not authorize them to manage. … |
| Remediation | Consult the Red Hat security advisory at https://access.redhat.com/security/cve/CVE-2026-18571 for patched package versions - exact fix versions are not confirmed in the available data and should not be inferred. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit Keycloak deployments to identify instances with Fine-Grained Admin Permissions V2 enabled and document the scope of delegated sub-admin accounts. …
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View allVendor StatusVendor
Debian
Bug #1088287| Release | Status | Fixed Version | Urgency |
|---|---|---|---|
| open | - | - |
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-51925
GHSA-5vmc-qhfj-qxc3