---
id: CVE-2026-111707
title: >-
  99AI through 4.3.0 IDOR via /api/chatLog/querySingleChat Chat Message
  Disclosure
summary: >-
  99AI through 4.3.0 contains an insecure direct object reference vulnerability
  that allows unauthenticated attackers to read other users' chat messages
  because querySingleChat lacks an owner check. Attackers can send a fingerprint
  header …
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cvssSource: cna
cwe:
  - CWE-639
vendor: vastxie
product: 99AI
affected:
  - 99AI <= 4.3.0
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-16T18:19:32.858688Z'
exploitAvailable: true
published: '2026-10-16'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:20:01.823Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111707'
references:
  - url: 'https://hackmd.io/@hieuPenguinnn/99ai-chatlog-unauth-export-and-idor'
  - url: >-
      https://github.com/vastxie/99AI/blob/v4.3.0/service/src/modules/chatLog/chatLog.service.ts#L463-L475
  - url: >-
      https://github.com/vastxie/99AI/blob/v4.3.0/service/src/common/auth/jwtAuth.guard.ts
  - url: 'https://github.com/vastxie/99AI'
  - url: >-
      https://www.vulncheck.com/advisories/99ai-through-4.3.0-idor-via-api-chatlog-querysinglechat-chat-message-disclosure
    label: >-
      VulnCheck Advisory: 99AI through 4.3.0 IDOR via
      /api/chatLog/querySingleChat Chat Message Disclosure
tags:
  - cve.org
  - exploit-available
ingestedAt: '2026-10-16T18:43:08.625Z'
---

## Overview

99AI through 4.3.0 contains an insecure direct object reference vulnerability that allows unauthenticated attackers to read other users' chat messages because querySingleChat lacks an owner check. Attackers can send a fingerprint header to obtain a visitor JWT and iterate sequential chatId values to retrieve other users' message content and task data.

## Affected

- `99AI <= 4.3.0`

## Remediation

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