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CVE-2026-73601

Flowise before 3.1.3 Remote Code Execution via Custom MCP

Published: Aug 13, 2026Updated: Sep 4, 2026 Sources: CVE List NVDCWE-95
8.8HIGH
NVD MITRE
EPSS Score
0.9%
Top 43.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

Description

Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOM_MCP_PROTOCOL is set to stdio, allowing authenticated users to execute arbitrary commands by manipulating environment variables and command arguments. Attackers can abuse PYTHONWARNINGS and BROWSER environment variables with python3, or leverage the root working directory with node to bypass validation and execute system commands.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-95

Affected Products

FlowiseAI
oss-projectaka flowise, flowise-components, embed
FlowiseOn-premWeb App
AI / ML / ai-agent-tooling
and 1 more affected products View all →

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-73601?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-g98q-rm45-q9h8
github.com
https://www.vulncheck.com/advisories/flowise-before-remote-code-execution-via-custom-mcp
vulncheck.com
News mentions
1

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