Auth bypass in Appflowy-Io Appflowy-Cloud
CVE-2026-85622
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 32.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
Weakness classification (CWE)
References
- github.com/AppFlowy-IO/AppFlowy-Cloud (product)
- github.com/AppFlowy-IO/AppFlowy-Cloud/blob/0.9.64/src/api/ws.rs (technical-description)
- github.com/AppFlowy-IO/AppFlowy-Cloud/issues/1629 (issue-tracking)
- www.vulncheck.com/advisories/appflowy-cloud-through-0.9.64-cross-workspace-coll… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-85622?
- CVE-2026-85622 is a medium-severity vulnerability in Appflowy-Io Appflowy-Cloud, classified under Incorrect Authorization. CVSS score: 5.3/10. Published 2026-09-04.
- How severe is CVE-2026-85622?
- Medium severity. CVSS v3 base score is 5.3 out of 10.