Critical
Flowise before 3.1.3 Remote Code Execution via Custom MCP
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-73601
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 4 Nov 2026, 03:43 UTC · Revision 1
Source evidence
Flowise before 3.1.3 Remote Code Execution via Custom MCP
core-osv · Original sourcePublished 13 Aug 2026, 11:28 UTC
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.
osv:CVE-2026-73601
Complete source record
{
"id": "d6c987e85432f9e1f5fff47870ca5757a7c48e05db3750853d01c61838eb6a82",
"url": "https://osv.dev/vulnerability/CVE-2026-73601",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Flowise before 3.1.3 Remote Code Execution via Custom MCP",
"summary": "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.",
"evidence": "osv:CVE-2026-73601",
"products": [],
"severity": "critical",
"structured": {
"id": "CVE-2026-73601",
"aliases": [
"CVE-2026-73601",
"GHSA-g98q-rm45-q9h8"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/flowiseai/flowise",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "09f099dbfda179e439ec677d06ad737375899eef"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"fixed": "3.1.3"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"cpe": "cpe:2.3:a:flowiseai:flowise:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "3.1.3"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-73601.json"
}
}
],
"modified": "2026-10-28T02:30:32.814950196Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73601.json",
"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-g98q-rm45-q9h8",
"https://nvd.nist.gov/vuln/detail/CVE-2026-73601",
"https://www.vulncheck.com/advisories/flowise-before-remote-code-execution-via-custom-mcp"
],
"provider_metadata": {
"cwe_ids": [
"CWE-95"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/73xxx/CVE-2026-73601.json"
}
},
"related_cves": [
{
"value": "CVE-2026-73601",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 500090,
"published_at": "2026-08-13T11:28:08.066+00:00"
}