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Critical, CVSS 9.2amended

Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified

CVE-2026-69255GHSA-vmv7-4m6c-3cg5

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (flowise-components 3.1.3; flowise 3.1.3), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS 4.0
9.2 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N · score source
EPSS
  • CVE-2026-69255: 0.60% estimated exploitation activity in the next 30 days; percentile 48.84 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

UPDATE 2026-05-20: Full RCE as root VERIFIED This is not theoretical — a Meterpreter reverse shell session as root has been established on Flowise 3.1.2. Verified Exploit Chain 1. Python code injection via base64string = "${base64String}" (CSVAgent.ts line 161) 2. Pyodide js bridge provides access to the host Node.js process 3. process.mainModule.constructor.load('childprocess') loads childprocess (bypasses ESM require restriction) 4. .execSync('CMD') executes arbitrary OS commands as root (PID 1 in container) Working RCE Payload Constraint: No commas allowed in payload — csvFile.split(',') splits on all commas. Metasploit Session Proof Additional Verified Impact Credential Theft: Arbitrary File Read via process.binding('fs').readFileUtf8('/etc/hostname') → cbce3fb352b7 Server DoS — certain native binding calls (spawnsync) crash the Node.js process entirely. CVSS v3.1: 9.9 CRITICAL AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H --- Original Report (below) Vulnerable Code File:…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 4 · amended ·

    Amended from ghsa record GHSA-vmv7-4m6c-3cg5

  2. Revision 3 · amended ·

    Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

  3. Revision 2 · amended ·

    Amended from osv record GHSA-vmv7-4m6c-3cg5

  4. Revision 1 · created ·

    Published from ghsa record GHSA-vmv7-4m6c-3cg5

Agent brief

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# Patch Next advisory brief: CVE-2026-69255

Advisory: Flowise: CSV Agent Remote Code Execution via Pyodide Code Injection — Root Shell Verified
IDs: CVE-2026-69255, GHSA-vmv7-4m6c-3cg5
Record: https://patchnext.com/advisories/cve-2026-69255 (revision 4, source checked 26 Oct 2026, 13:00 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.2)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: flowise-components 3.1.3; flowise 3.1.3. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm flowise-components: affected <= 3.1.2; fixed in 3.1.3
- npm flowise: affected <= 3.1.2; fixed in 3.1.3

## Suggested inspection (read-only)
- `npm ls flowise-components --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.
- `npm ls flowise --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on flowise-components, flowise.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-vmv7-4m6c-3cg5 (GitHub-reviewed advisory GHSA-vmv7-4m6c-3cg5 lists affected ranges: npm flowise >=0 =0 <=3.1.2)
- Verified: https://osv.dev/vulnerability/GHSA-vmv7-4m6c-3cg5 (OSV record GHSA-vmv7-4m6c-3cg5 lists affected ranges: npm flowise >=0 =0 <3.1.3 (fixed))

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