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Red Hat Keycloak EUVDEUVD-2026-51925

| CVE-2026-18571 HIGH
Missing Authorization (CWE-862)
2026-08-02 redhat GHSA-5vmc-qhfj-qxc3
7.2
CVSS 3.1 · NVD
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Severity by source

Vendor (redhat) PRIMARY
MEDIUM
qualitative
NVD
7.2 HIGH
AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
6.5 MEDIUM

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.

3.1 AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
4.0 AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Red Hat
6.6 MEDIUM
qualitative

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
Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Updated
Aug 07, 2026 - 18:44 vuln.today
v2 (cvss_changed)
Re-analysis Queued
Aug 07, 2026 - 18:37 vuln.today
cvss_changed
Severity Changed
Aug 07, 2026 - 18:37 NVD
MEDIUM HIGH
CVSS changed
Aug 07, 2026 - 18:37 NVD
6.6 (MEDIUM) 7.2 (HIGH)
Analysis Generated
Aug 02, 2026 - 06:32 vuln.today

DescriptionNVD

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

Access
Obtain sub-admin credentials with user-create scope
Delivery
Access Keycloak admin console over network
Exploit
Enable or confirm FGAP V2 is active
Execution
Create new user and assign to unauthorized privileged group
Persist
Authenticate as newly created user
Impact
Access sensitive resources via unauthorized group membership

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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Threat intelligence, references, and detailed analysis are available after sign-in.

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Vendor StatusVendor

Debian

Bug #1088287
keycloak
Release Status Fixed Version Urgency
open - -

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EUVD-2026-51925 vulnerability details – vuln.today

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