CVE
CVE-2026-73601
Flowise before 3.1.3 Remote Code Execution via Custom MCP
Flowise versions before 3.1.3 contain a remote code execution vulnerability in the Custom MCP node when CUSTOMMCPPROTOCOL 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.
Package Versions Affected
Package Version
patch Availability
No items found.
Automatically patch vulnerabilities without upgrading
Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request
CVSS Version
Severity
Base Score
CVSS Version
Score Vector
C
H
U
9
-
4.0
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/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
C
H
U
0
-
C
H
U
-
Related Resources
No items found.
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