Staging Environment: Content and features may be unstable or change without notice.
Advisory details: github_osv / GHSA-q2xp-j85q-883h
Advisory ID github_osv/GHSA-q2xp-j85q-883h
Aliases
Summary Duplicate Advisory: Flowise has unsandboxed remote code execution via Custom MCP ### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-6933-jpx5-q87q. This link is maintained to preserve external references. ### Original 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.
Status Published
Exploitability 0.5
Weighted Severity 8.8
Risk 4.4
Affected and Fixed Packages Package Details
Introduced and Fixed Package Commit Patches Package Commit Patches Details
Weaknesses (1)
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
System Score Found at
cvssv3.1 9.8 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q2xp-j85q-883h/GHSA-q2xp-j85q-883h.json
cvssv4 9.3 https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q2xp-j85q-883h/GHSA-q2xp-j85q-883h.json
generic_textual CRITICAL
Reference id Reference type URL
https://www.vulncheck.com/advisories/flowise-unsandboxed-remote-code-execution-via-custom-mcp
CVE-2025-71336 https://nvd.nist.gov/vuln/detail/CVE-2025-71336
GHSA-6933-jpx5-q87q https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-6933-jpx5-q87q
No exploits are available.

No EPSS data available for this advisory.

Patch URL
There are no known patches.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q2xp-j85q-883h/GHSA-q2xp-j85q-883h.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Found at https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/06/GHSA-q2xp-j85q-883h/GHSA-q2xp-j85q-883h.json
Attack Vector (AV) Attack Complexity (AC) Attack Requirements (AT) Privileges Required (PR) User Interaction (UI) Vulnerable System Impact Confidentiality (VC) Vulnerable System Impact Integrity (VI) Vulnerable System Impact Availability (VA) Subsequent System Impact Confidentiality (SC) Subsequent System Impact Integrity (SI) Subsequent System Impact Availability (SA)

network

adjacent

local

physical

low

high

none

present

none

low

high

none

passive

active

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

high

low

none

There are no SSVC decisions available.