CVE-2026-42861
Flowise: Mass Assignment in Variable Update Endpoint Allows Cross-Workspace Resource Reassignment
HIGH 7.6EPSS 0.4%
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
- FlowiseAI · Flowise
- CVSS v4.0 GITHUB
- 7.6 HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - CVSS v4.0 GitHub
- 7.6 HIGH
CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N - CVSS v3.1 NVD
- 9.6 CRITICAL
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N - EPSS
- 0.37% chance of exploitation in the next 30 days, 29th percentile
- Published
- 2026-06-08
- Updated
- 2026-06-09
Proof-of-concept exploits (1)
Security advisories
- FlowiseAI/Flowise/security/advisories/GHSA-6fw7-3q8r-m5vj
- FlowiseAI/Flowise/releases/tag/flowise%403.1.2