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CVE-2026-42862 FlowiseAI CVE debrief

CVE-2026-42862 is a high-severity vulnerability in FlowiseAI Flowise, a drag-and-drop user interface for building customized large language model flows. The issue, patched in version 3.1.2, allows authenticated users to manipulate the workspaceId field and reassign tools to arbitrary workspaces, breaking tenant isolation in multi-workspace environments.

Vendor
FlowiseAI
Product
Flowise
CVSS
HIGH 7.6
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-07-23
Advisory published
2026-06-08
Advisory updated
2026-07-23

Who should care

Users of FlowiseAI Flowise, especially those with multi-workspace environments, should be aware of this vulnerability and take immediate action to patch their installations.

Technical summary

A mass assignment vulnerability exists in the tool update endpoint of FlowiseAI Flowise. Prior to version 3.1.2, authenticated users can modify server-controlled properties such as workspaceId, createdDate, and updatedDate when updating a tool resource. This is possible due to missing server-side validation and authorization checks. An attacker can manipulate the workspaceId field, reassigning tools to arbitrary workspaces and breaking tenant isolation in multi-workspace environments.

Defensive priority

High

Recommended defensive actions

  • Update FlowiseAI Flowise to version 3.1.2 or later to patch the vulnerability.
  • Review and restrict access to the tool update endpoint to ensure only authorized users can modify tool resources.
  • Monitor your FlowiseAI Flowise installation for any suspicious activity related to tool updates and workspace assignments.

Evidence notes

The CVE-2026-42862 vulnerability has been patched in FlowiseAI Flowise version 3.1.2. For more information, see [ref-4](https://github.com/FlowiseAI/Flowise/releases/tag/flowise%403.1.2) and [ref-5](https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-x5v6-pj28-cwwm).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42862 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42862

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-42862 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42862

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.