AppFlowy-Cloud Vulnerability in Bulk Publish Endpoint for Authorization
CVE-2026-88898

7.1HIGH

Key Information:

Vendor

Appflowy-io

Status
Appflowy-cloud
Vendor
CVE Published:
10 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-88898?

The AppFlowy-Cloud product from AppFlowy has a security flaw in its bulk publish endpoint, which does not adequately verify the authorization of users against workspaces. This oversight allows authenticated users to publish content to other tenants' namespaces. As a result, attackers could potentially manipulate published views to include malicious titles, bodies, and metadata, leading to defacement of public pages or the hosting of phishing content on otherwise trusted URLs.

Affected Version(s)

AppFlowy-Cloud 0.7.2 <= 0.9.64

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-88898 - Proof of Concept

References

https://gist.github.com/mtholmquist/ab550712a4628c7c7c470...
technical-descriptionexploit
https://github.com/AppFlowy-IO/AppFlowy-Cloud
product
https://github.com/AppFlowy-IO/AppFlowy-Cloud/blob/0.9.64...
technical-description

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Michael Holmquist
.