Auth bypass in Appflowy-Io Appflowy-Cloud
CVE-2026-88898
AppFlowy-Cloud versions 0.7.2 through 0.9.64 fail to authorize callers against the workspace in the bulk publish endpoint path, allowing authenticated users to publish content into other tenants' namespaces. Attackers can write published views with attacker-controlled title, body and metadata into victim workspaces to deface public pages or host phishing content on trusted URLs.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (32.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
Weakness classification (CWE)
References
- gist.github.com/mtholmquist/ab550712a4628c7c7c4705bceccd93b3 (technical-description, exploit)
- github.com/AppFlowy-IO/AppFlowy-Cloud (product)
- github.com/AppFlowy-IO/AppFlowy-Cloud/blob/0.9.64/src/biz/workspace/publish.rs (technical-description)
- github.com/AppFlowy-IO/AppFlowy-Cloud/blob/0.9.64/src/api/workspace.rs (technical-description)
- www.vulncheck.com/advisories/appflowy-cloud-0.7.2-through-0.9.64-missing-worksp… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-88898?
- CVE-2026-88898 is a medium-severity vulnerability in Appflowy-Io Appflowy-Cloud, classified under Missing Authorization. CVSS score: 6.5/10. Published 2026-09-10.
- How severe is CVE-2026-88898?
- Medium severity. CVSS v3 base score is 6.5 out of 10.