What’s Vulnerable › Vulnerabilities

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

• Severity: critical (CVSS 9.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-06-08 · updated 2026-07-23
• Weakness: CWE-284

Description

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 products

• FlowiseAI Flowise: before 3.1.2 — fixed in 3.1.2

How to fix

Upgrade to a fixed version: FlowiseAI Flowise 3.1.2. Check the vendor advisory for mitigations.

References

• https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2
• https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6fw7-3q8r-m5vj

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