---
id: CVE-2026-111654
title: FastBee through 2.1.0 IDOR via /iot/group By-ID Endpoints
summary: >-
  FastBee through 2.1.0 contains an insecure direct object reference
  vulnerability that allows authenticated low-privilege users to access other
  users' device groups because GroupController queries lack owner checks.
  Attackers, including s…
severity: medium
cvss: 6.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L'
cvssSource: cna
cwe:
  - CWE-639
vendor: kerwincui
product: FastBee
affected:
  - FastBee <= 2.1.0
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T17:39:20.715Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111654'
references:
  - url: 'https://hackmd.io/@hieuPenguinnn/fastbee-device-group-cross-user-idor'
  - url: >-
      https://github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-open-api/src/main/java/com/fastbee/data/controller/GroupController.java#L70-L137
  - url: >-
      https://github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-service/fastbee-iot-service/src/main/java/com/fastbee/iot/service/impl/GroupServiceImpl.java#L37-L143
  - url: >-
      https://github.com/kerwincui/FastBee/blob/v2.1.0/springboot/fastbee-service/fastbee-iot-service/src/main/resources/mapper/iot/GroupMapper.xml#L36-L109
  - url: >-
      https://www.vulncheck.com/advisories/fastbee-through-2.1.0-idor-via-iot-group-by-id-endpoints
    label: >-
      VulnCheck Advisory: FastBee through 2.1.0 IDOR via /iot/group By-ID
      Endpoints
tags:
  - cve.org
ingestedAt: '2026-10-16T18:43:08.675Z'
---

## Overview

FastBee through 2.1.0 contains an insecure direct object reference vulnerability that allows authenticated low-privilege users to access other users' device groups because GroupController queries lack owner checks. Attackers, including self-registered users, can supply sequential group IDs to read, overwrite, reassign, rewrite device associations of, or delete other users' groups.

## Affected

- `FastBee <= 2.1.0`

## Remediation

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