---
id: CVE-2026-111681
title: EFAK through 5.1.0 Privilege Escalation via /api/users REST API
summary: >-
  EFAK through 5.1.0 contains a missing authorization vulnerability that allows
  authenticated low-privilege users to manage accounts because the /api/users
  endpoints lack administrator role checks. Attackers can send POST, PUT, or
  DELETE r…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-862
vendor: smartloli
product: EFAK
affected:
  - EFAK >= 5.0.0 <= 5.1.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T20:51:54.682916Z'
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T21:17:35.235Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111681'
references:
  - url: >-
      https://hackmd.io/@hieuPenguinnn/efak-missing-admin-gate-user-management-api
  - url: >-
      https://github.com/smartloli/EFAK/blob/v5.1.0/efak-web/src/main/java/org/kafka/eagle/web/security/config/WebSecurityConfig.java#L89-L93
  - url: >-
      https://github.com/smartloli/EFAK/blob/v5.1.0/efak-web/src/main/java/org/kafka/eagle/web/controller/UserController.java#L218-L302
  - url: 'https://github.com/smartloli/EFAK'
  - url: >-
      https://www.vulncheck.com/advisories/efak-through-5.1.0-privilege-escalation-via-api-users-rest-api
    label: >-
      VulnCheck Advisory: EFAK through 5.1.0 Privilege Escalation via /api/users
      REST API
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.662Z'
---

## Overview

EFAK through 5.1.0 contains a missing authorization vulnerability that allows authenticated low-privilege users to manage accounts because the /api/users endpoints lack administrator role checks. Attackers can send POST, PUT, or DELETE requests to UserController to grant themselves ROLE_ADMIN, create administrators, or delete users, gaining control of managed Kafka clusters.

## Affected

- `EFAK >= 5.0.0 <= 5.1.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.