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VulnerabilityPublished

CVE-2026-40933: FlowiseAI Flowise · OS Command Injection

Affects FlowiseAI FlowiseSource CVE Database V5

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Not known to be exploited · 11% EPSS · CVSS 10.0 Critical : upgrade to 3.1.0 as a priority.

Data as of 29 Oct 2026, 19:04 UTC

CVSS 3.1 base score
10.0Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
11.9% chance of exploitation in 30 days – higher than 96% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 3.1.0
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 21 Apr 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.

What to do

Upgrade Flowise and flowise-components and flowiseai/Flowise to 3.1.0.

Affected software

ProductAffectedFixed in
FlowiseAIFlowiseAffected
  • <3.1.0
Fixed in
  • 3.1.0
FlowiseAIflowise-componentsAffected
  • <3.1.0
Fixed in
  • 3.1.0
GitHubflowiseai/Flowisepkg:github/flowiseai/FlowiseOther threatsAffected
  • <3.1.0
Fixed in
  • 3.1.0

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Upgrade Flowise to version 3.1.0 or later, where this vulnerability is fixed. Since this is not a cloud service, remediation depends on user action to update the software.

Description

CVE-2026-40933 is a critical OS command injection vulnerability in FlowiseAI's Flowise product prior to version 3.1.0. It arises from unsafe serialization of stdio commands in the MCP adapter, allowing an authenticated attacker to add a malicious MCP stdio server with arbitrary commands. Despite input sanitization attempts, attackers can bypass these checks and execute arbitrary OS commands. This vulnerability is fixed in Flowise version 3.1.0.

References

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