CVE-2026-70470Public exploitNetwork attack vector

Unauthenticated RCE via Unicode homoglyph blacklist bypass

Published Aug 4, 2026 · Updated Aug 4, 2026

Code injection in Flowise before 3.1.3 allows remote attackers to execute host OS commands through public CSV or Airtable Agent chatflows. validatePythonCodeForDataFrame applies ASCII word-boundary blacklist rules before Python normalizes homoglyph identifiers, letting forbidden object paths reach Pyodide's JavaScript bridge. A public chatflow using either affected agent is sufficient; execution inherits the Flowise process privileges and can read or write reachable files.

CVSS severity9.5
Critical
EPSS probability0.87%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in Flowise before 3.1.3 allows remote attackers to execute host OS commands through public CSV or Airtable Agent chatflows. validatePythonCodeForDataFrame applies ASCII word-boundary blacklist rules before Python normalizes homoglyph identifiers, letting forbidden object paths reach Pyodide's JavaScript bridge. A public chatflow using either affected agent is sufficient; execution inherits the Flowise process privileges and can read or write reachable files.

The record

CVE
CVE-2026-70470
Published
Aug 4, 2026
Updated
Aug 4, 2026
Vendor
FlowiseAI
Product
Flowise
Classifications
CWE-184, T1059.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.1.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

FlowiseAI · Flowiseversion=< 3.1.3

Published CVSS scores

9.5GitHub, Inc.CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-184Incomplete List of Disallowed Inputs
T1059.006Command and Scripting Interpreter Python

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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