CVE-2026-42862 Flowise: Mass Assignment in Tool Update Endpoint Allows Cross-Workspace Resource Reassignment
Authenticated attackers can reassign tools to arbitrary workspaces via mass assignment, breaking tenant isolation in Flowise.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-42862?
CVE-2026-42862 is a high-severity missing authorization vulnerability in Flowiseai Flowise, published on 8 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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 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. This issue has been patched in version 3.1.2.
Which versions are affected by CVE-2026-42862?
2 open source packages ship an affected version, including flowise. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
flowise npm | All versions | 3.1.2 |
flowise npm | All versions | 3.1.2 |
Products include Flowiseai Flowise.
How do I fix CVE-2026-42862?
Upgrade flowise to 3.1.2 or later.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-42862 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-42862 exists.
Other vulnerabilities in Flowiseai Flowise
- CVE-2025-71338 Flowise through 2.2.7 - Arbitrary File Write to Remote Code Execution via document-store API
- CVE-2026-40933 Flowise: Authenticated RCE Via MCP Adapters
- CVE-2025-61913 Flowise is vulnerable to arbitrary file read, arbitrary file write
- CVE-2025-59528 Flowise has Remote Code Execution vulnerability
- CVE-2026-52098 Code injection in n/a
Sources
Also known as GHSA-x5v6-pj28-cwwm.