CVE-2026-91931
CVSS v3
8.5
HIGH
EPSS Score
0.7 %
exploit probability, as of 2026-09-28
CISA KEV
No
known exploited
Exploitation
—
SSVC status
Description
Flowise before 3.1.4 contains a remote code execution vulnerability in the Custom MCP node that allows authenticated attackers to execute arbitrary code by supplying npx package names in the mcpServerConfig parameter. Attackers can invoke npx with attacker-controlled npm packages to execute code on the Flowise server.
Technical details
- Published
- 2026-09-15
- Last Modified
- 2026-09-17
Frequently asked questions
What is CVE-2026-91931?
Flowise before 3.1.4 contains a remote code execution vulnerability in the Custom MCP node that allows authenticated attackers to execute arbitrary code by supplying npx package names in the mcpServerConfig parameter. Attackers can invoke npx with attacker-controlled npm packages to execute code on the Flowise server.
Is CVE-2026-91931 actively exploited?
Active exploitation of CVE-2026-91931 has not been confirmed. Its EPSS score was 0.7% on 2026-09-28, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-91931?
CVE-2026-91931 has a CVSS v3 base score of 8.5 (HIGH severity).
Is CVE-2026-91931 affecting your environment?
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