CVE-2026-42861

Summary

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 Software

Weaknesses

• CWE-284: CWE-284: Improper Access Control
• CWE-639: CWE-639: Authorization Bypass Through User-Controlled Key
• CWE-915: CWE-915: Improperly Controlled Modification of Dynamically-Determined Object Attributes

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: partial

References

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

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