Flowise: Mass Assignment in Variable Update Endpoint Allows Cross-Workspace Resource Reassignment
CVE-2026-42861

7.6HIGH

Key Information:

Vendor

Flowiseai

Status
Flowise
Vendor
CVE Published:
8 June 2026

What is CVE-2026-42861?

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to version 3.1.2, a mass assignment vulnerability exists in the variable update endpoint of FlowiseAI. The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a variable resource. Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign variables to arbitrary workspaces. This behavior may break tenant isolation in multi-workspace environments. This issue has been patched in version 3.1.2.

Affected Version(s)

Flowise < 3.1.2

References

https://github.com/FlowiseAI/Flowise/security/advisories/...
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https://github.com/FlowiseAI/Flowise/releases/tag/flowise...
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CVSS V4

Score:
7.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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