CVE-2026-41267: Flowiseai Flowise

Critical severity, CVSS 9.8. EPSS: 0.5% chance of exploitation in the next 30 days.

Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, an improper mass assignment (JSON injection) vulnerability in the account registration endpoint of Flowise Cloud allows unauthenticated attackers to inject server-managed fields and nested objects during account creation. This enables client-controlled manipulation of ownership metadata, timestamps, organization association, and role mappings, breaking trust boundaries in a multi-tenant environment. This vulnerability is fixed in 3.1.0.

Affected products

• Flowiseai Flowise: before 3.1.0 (fixed in 3.1.0)

Published 2026-04-23. Last modified 2026-06-17.