---
id: CVE-2026-85622
title: >-
  AppFlowy-Cloud through 0.9.64 fails to validate workspace membership when
  establishing WebSocket connections in the establish_ws_connection_v2 handler,
  allowing authenticated users to bind sessions to workspaces they do not belong
  to
summary: >-
  AppFlowy-Cloud through 0.9.64 fails to validate workspace membership when
  establishing WebSocket connections in the establish_ws_connection_v2 handler,
  allowing authenticated users to bind sessions to workspaces they do not belong
  to. At…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N'
cwe:
  - CWE-863
published: '2026-09-04'
updated: '2026-09-10'
sourceUpdated: '2026-09-10T15:53:23.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-85622'
references:
  - url: 'https://github.com/AppFlowy-IO/AppFlowy-Cloud'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/AppFlowy-IO/AppFlowy-Cloud/blob/0.9.64/src/api/ws.rs'
    label: disclosure@vulncheck.com
  - url: 'https://github.com/AppFlowy-IO/AppFlowy-Cloud/issues/1629'
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/appflowy-cloud-through-0.9.64-cross-workspace-collab-read-via-websocket
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00312
epssPercentile: 0.24306
ingestedAt: '2026-09-10T16:57:28.704Z'
---

## Overview

AppFlowy-Cloud through 0.9.64 fails to validate workspace membership when establishing WebSocket connections in the establish_ws_connection_v2 handler, allowing authenticated users to bind sessions to workspaces they do not belong to. Attackers can send sync Manifest messages with victim object identifiers to read full document or database state from collaborations in other workspaces without victim involvement.

## Remediation

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