What’s Vulnerable › Vulnerabilities

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

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-09-10
• Weakness: CWE-863

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.

Affected products

• AppFlowy-IO AppFlowy-Cloud: through 0.9.64

References

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

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