CVE-2026-73601CWE-95

CVE-2026-73601

High · published August 13, 2026

CVSS v3.1
8.8
EPSS
1%
Percentile
65.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
8.8 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.01099 · 65.4th percentile
Weakness
CWE-95 · Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection')
Published
2026-08-13T16:17Z
Affected products (1)
ProductVersionsFixed in
flowiseai/flowise< 3.1.33.1.3
References (2)
https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-g98q-rm45-q9h8 · [email protected]https://www.vulncheck.com/advisories/flowise-before-remote-code-execution-via-custom-mcp · [email protected]
EPSS history
Timeline
  • 13 AUG 11:28Z
    Flowise before 3.1.3 Remote Code Execution via Custom MCP
    cvelistv5