CVE-2026-42862: FlowiseAI has Mass Assignment in Tool Update Endpoint that Allows Cross-Workspace Resource Reassignment

May 14, 2026 (updated June 9, 2026)

A Mass Assignment vulnerability exists in the tool update endpoint of FlowiseAI.

The endpoint allows authenticated users to modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource.

Due to missing server-side validation and authorization checks, an attacker can manipulate the workspaceId field and reassign tools to arbitrary workspaces. This breaks tenant isolation in multi-workspace environments.

References

github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2
github.com/FlowiseAI/Flowise/security/advisories/GHSA-x5v6-pj28-cwwm
github.com/advisories/GHSA-x5v6-pj28-cwwm
nvd.nist.gov/vuln/detail/CVE-2026-42862

Code Behaviors & Features

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