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.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
None
No data modification
Availability
None
No disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/AppFlowy-IO/AppFlowy-Cloud
disclosure@vulncheck.com
https://github.com/AppFlowy-IO/AppFlowy-Cloud/blob/0.9.64/src/api/ws.rs
disclosure@vulncheck.com
https://github.com/AppFlowy-IO/AppFlowy-Cloud/issues/1629
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/appflowy-cloud-through-0.9.64-cross-worksp…
disclosure@vulncheck.com