CVE-2026-40933 Details
Flowise is a drag & drop user interface to build a customized large language model flow. Prior to 3.1.0, due to unsafe serialization of stdio commands in the MCP adapter, an authenticated attacker can add an MCP stdio server with an arbitrary command, achieving command execution. The vulnerability lies in a bug in the input sanitization from the “Custom MCP” configuration in http://localhost:3000/canvas - where any user can add a new MCP, when doing so - adding a new MCP using stdio, the user can add any command, even though your code have input sanitization checks such as validateCommandInjection and validateArgsForLocalFileAccess, and a list of predefined specific safe commands - these commands, for example "npx" can be combined with code execution arguments ("-c touch /tmp/pwn") that enable direct code execution on the underlying OS. This vulnerability is fixed in 3.1.0.
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Exploit prediction scoring system (EPSS) score for CVE-2026-40933
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.07 Probability of exploitation activity being observed over the next 30 days (22nd percentile)
CVSS score for CVE-2026-40933
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
9.9 Critical
Products affected by CVE-2026-40933
Flowise 1.8.3
Flowise 2.0.1
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Medium
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CVE-2026-40933 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 93 37.20%
DE 51 20.40%
GB 14 5.60%
SG 11 4.40%
NL 10 4.00%
FR 9 3.60%
ID 6 2.40%
CN 6 2.40%
IE 5 2.00%
IN 5 2.00%

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CVE-2026-40933 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 216 96.43%
Telecommunications 5 2.23%
Education 3 1.34%

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