CVE-2026-56274 Details
Flowise before 3.1.2 contains multiple OS command injection vulnerabilities in the Custom MCP Server feature due to incomplete command-flag validation and a regex bypass in local file access restrictions. An attacker with a Flowise account of any role, or API access with view/update permissions for chatflows, can configure a malicious MCP server to bypass the validateCommandFlags blocklist (for example, 'docker build' is not blocked, and 'npx --yes' is not blocked while only '-y' is) and the validateArgsForLocalFileAccess checks, resulting in execution of arbitrary commands on the Flowise host.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2026-56274
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%).
2.68 Probability of exploitation activity being observed over the next 30 days (84th percentile)
CVSS score for CVE-2026-56274
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-2026-56274
Flowise 1.5.0
Flowise 2.0.1
Flowise 2.1.4
Flowise 1.8.2
Flowise 1.7.2
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.
Low
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CVE-2026-56274 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 221 34.64%
DE 116 18.18%
GB 36 5.64%
SG 34 5.33%
NL 31 4.86%
AU 18 2.82%
FR 17 2.66%
ID 13 2.04%
SE 13 2.04%
IE 12 1.88%

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CVE-2026-56274 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 536 95.54%
Telecommunications 16 2.85%
Education 6 1.07%
Government/Politics 2 0.36%
Finance 1 0.18%

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