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CVE-2025-71336

Flowise - Unsandboxed Remote Code Execution via Custom MCP

Published: Jun 25, 2026Updated: Jul 1, 2026 Sources: CVE List NVDCWE-78
9.8CRITICAL
NVD MITRE
EPSS Score
1.6%
Top 26.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
OpenVAS

Description

Flowise before 3.0.6 (affected versions 2.2.7-patch.1 and earlier) contains an unsandboxed remote code execution vulnerability in the Custom MCP feature, which is designed to execute OS commands such as launching local MCP servers. Because Flowise's authentication and authorization model is minimal and lacks role-based access control, and the default installation runs without authentication unless FLOWISE_USERNAME and FLOWISE_PASSWORD are set, an attacker can send a crafted JSON payload with the header 'x-request-from: internal' to the /api/v1/node-load-method/customMCP endpoint to execute arbitrary OS commands, resulting in complete compromise of the platform container or server.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-78

Affected Products

Flowise
oss-projectaka flowise-ai
FlowiseSaaS
AI / ML / ai-agent-tooling
flowiseai
oss-projectaka flowise, flowise-components, embed
flowiseOn-premWeb App
AI / ML / ai-agent-tooling

Exploitability

Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Execution
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References

https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6933-jpx5-q87q
github.com
https://www.vulncheck.com/advisories/flowise-unsandboxed-remote-code-execution-via-custom-mcp
vulncheck.com

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