---
id: CVE-2026-110611
title: >-
  REBUILD through 4.5.0 contains an authorization bypass vulnerability in
  AiBot2Controller /aibot2 endpoints that act on a caller-supplied chatid
  without verifying ownership
summary: >-
  REBUILD through 4.5.0 contains an authorization bypass vulnerability in
  AiBot2Controller /aibot2 endpoints that act on a caller-supplied chatid
  without verifying ownership. Authenticated low-privilege users can supply
  another user's chat…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N'
cwe:
  - CWE-639
published: '2026-10-14'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T15:17:13.053'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-110611'
references:
  - url: >-
      https://github.com/getrebuild/rebuild/blob/48c6cc42f9c331cc57c057fa9c66d6cbda990131/src/main/java/com/rebuild/core/aibot2/ChatManager.java#L99-L101
    label: disclosure@vulncheck.com
  - url: >-
      https://github.com/getrebuild/rebuild/blob/48c6cc42f9c331cc57c057fa9c66d6cbda990131/src/main/java/com/rebuild/web/aibot/AiBot2Controller.java#L151-L203
    label: disclosure@vulncheck.com
  - url: >-
      https://hackmd.io/@1ExmmukzRMWN7B4gQ4W-4Q/getrebuild-rebuild-aibot-chat-idor
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/rebuild-through-4.5.0-authorization-bypass-via-aibot2-chat-endpoints-chatid
    label: disclosure@vulncheck.com
tags:
  - nvd
ingestedAt: '2026-10-14T15:36:14.005Z'
---

## Overview

REBUILD through 4.5.0 contains an authorization bypass vulnerability in AiBot2Controller /aibot2 endpoints that act on a caller-supplied chatid without verifying ownership. Authenticated low-privilege users can supply another user's chatid to chat-init, chat-delete, chat-feedback, or chat-stream-stop to read, delete, exfiltrate, or interrupt AI assistant conversations.

## Remediation

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