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PatchSiren cyber security CVE debrief

CVE-2026-42863 FlowiseAI CVE debrief

A mass assignment vulnerability exists in the chatflow update endpoint of FlowiseAI Flowise prior to version 3.1.2. This vulnerability allows an authenticated user to manipulate internal attributes of a chatflow and reassign it to another workspace, potentially leading to cross-workspace resource reassignment and unauthorized modification of deployment and visibility settings.

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 who have not upgraded to version 3.1.2, should be aware of this vulnerability and take necessary precautions to prevent exploitation.

Technical summary

The vulnerability is caused by missing server-side validation and authorization checks in the chatflow update endpoint. This allows clients to modify server-controlled properties such as deployed, isPublic, workspaceId, createdDate, and updatedDate when updating a chatflow object.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade FlowiseAI Flowise to version 3.1.2 or later.
  • Review and restrict access to the chatflow update endpoint to ensure only authorized users can modify chatflow objects.
  • Monitor chatflow updates and workspace assignments for suspicious activity.

Evidence notes

The vulnerability was patched in version 3.1.2 of FlowiseAI Flowise. 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-5wxp-qjgq-fx6m).

Sources and references

Verified primary and authoritative sources

  • CVE-2026-42863 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-42863

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

  • CVE-2026-42863 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-42863

    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.