Medium severity · published Sep 4, 2026
CVE-2026-85622
AppFlowy-Cloud through 0.9.64 Cross-Workspace Collab Read via WebSocket
5.3
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
High
Privileges
Low
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 34% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AP
AppFlowy-Cloud · AppFlowy-IO
through 0.9.64 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-85622
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-85622
github.com
https://github.com/AppFlowy-IO/AppFlowy-Cloud
github.com
https://github.com/AppFlowy-IO/AppFlowy-Cloud/blob/0.9.64/src/api/ws.rs
github.com
https://github.com/AppFlowy-IO/AppFlowy-Cloud/issues/1629
www.vulncheck.com
https://www.vulncheck.com/advisories/appflowy-cloud-through-0.9.64-cross-workspace-collab-read-via-websocket
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