Authorization Flaw in Flowise Affects Document Store Operations
CVE-2026-67621

7.2HIGH

Key Information:

Vendor

Flowiseai

Status
Flowise
Vendor
CVE Published:
6 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-67621?

The Flowise product versions up to 3.1.4 exhibit a significant vulnerability due to missing authorization checks. This flaw enables authenticated users with mere view-level permissions to carry out unauthorized actions on the document store. By exploiting unprotected mutation endpoints, an attacker can directly interact with the system, triggering document ingestion, refreshing database contents, and modifying knowledge bases. This not only compromises the integrity of data but also affects downstream processes reliant on chatflows. It's crucial for users of Flowise to address this vulnerability to prevent unauthorized access and maintain data security.

Affected Version(s)

Flowise 0 <= 3.1.4

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-2026-67621 - Proof of Concept

References

https://github.com/Caycon/cve-advisories/blob/main/2026/F...
technical-descriptionexploit
https://flowiseai.com/sunset
vendor-advisory

CVSS V4

Score:
7.2
Severity:
HIGH
Confidentiality:
Low
Integrity:
High
Availability:
Low
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

CayCon, piropatriot
.