---
id: "CVE-2026-111654"
kind: "vulnerability"
aliases: ["CVE-2026-111654"]
title: "FastBee: authenticated users can read and change other users' device groups"
severity: "medium"
cvss: 6.3
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["fastbee", "iot", "package", "self-hosted"]
not_affected_if: ["auth-required", "single-user-instance"]
published_at: "2026-10-16T18:17:46+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-25T04:01:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111654", "first_seen_at": "2026-10-23T21:57:13+00:00"}]
---

# FastBee: authenticated users can read and change other users' device groups

FastBee through 2.1.0 has a missing ownership check in GroupController, so any logged-in user can supply another user's sequential group ID. An attacker can then read, overwrite, reassign, or delete that user's device groups.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the installed FastBee version; the sources say versions through `2.1.0` are affected.
- Review the GroupController group read, update and delete endpoints for an owner or tenant check on the group ID.

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111654

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_