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CVE-2026-40933

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 ca
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:4a9c40dc35166c15c946d9ef6df7da9694352a074fcf46eff4c052f3598ca3f3
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

affected · 2 assertions

{"product":"flowise-components","vendor":"FlowiseAI","versions":[{"status":"affected","version":"< 3.1.0"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9423b2979a2fa3f5c0964ea0a6f4943ede4ad2d4b91acb5f526c3ab777518137 · sha256:b7429234f9854aed… · /containers/cna/affected/1

{"product":"Flowise","vendor":"FlowiseAI","versions":[{"status":"affected","version":"< 3.1.0"}]}

  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9423b2979a2fa3f5c0964ea0a6f4943ede4ad2d4b91acb5f526c3ab777518137 · sha256:b7429234f9854aed… · /containers/cna/affected/0

Affected products and versions

2 source assertions
{"product":"flowise-components","vendor":"FlowiseAI","versions":[{"status":"affected","version":"< 3.1.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9423b2979a2fa3f5c0964ea0a6f4943ede4ad2d4b91acb5f526c3ab777518137 · sha256:b7429234f9854aed… · /containers/cna/affected/1
{"product":"Flowise","vendor":"FlowiseAI","versions":[{"status":"affected","version":"< 3.1.0"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:9423b2979a2fa3f5c0964ea0a6f4943ede4ad2d4b91acb5f526c3ab777518137 · sha256:b7429234f9854aed… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":10,"baseSeverity":"CRITICAL","confidentialityImpact":"HIGH","integrityImpact":"HIGH","privilegesRequired":"LOW","scope":"CHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:9423b2979a2fa3f5c0964ea0a6f4943ede4ad2d4b91acb5f526c3ab777518137 · sha256:b7429234f9854aed… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-78","description":"CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:9423b2979a2fa3f5c0964ea0a6f4943ede4ad2d4b91acb5f526c3ab777518137 · sha256:b7429234f9854aed… · /containers/cna/problemTypes/0/descriptions/0

Source references

4 source assertions
{"name":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-c9gw-hvqq-f33r","tags":["x_refsource_CONFIRM"],"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-c9gw-hvqq-f33r"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9423b2979a2fa3f5c0964ea0a6f4943ede4ad2d4b91acb5f526c3ab777518137 · sha256:b7429234f9854aed… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-c9gw-hvqq-f33r"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9423b2979a2fa3f5c0964ea0a6f4943ede4ad2d4b91acb5f526c3ab777518137 · sha256:b7429234f9854aed… · /containers/adp/0/references/0
{"name":"https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem","tags":["x_refsource_MISC"],"url":"https://www.ox.security/blog/mcp-supply-chain-advisory-rce-vulnerabilities-across-the-ai-ecosystem"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9423b2979a2fa3f5c0964ea0a6f4943ede4ad2d4b91acb5f526c3ab777518137 · sha256:b7429234f9854aed… · /containers/cna/references/1
{"name":"https://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp","tags":["x_refsource_MISC"],"url":"https://www.ox.security/blog/the-mother-of-all-ai-supply-chains-critical-systemic-vulnerability-at-the-core-of-the-mcp"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:9423b2979a2fa3f5c0964ea0a6f4943ede4ad2d4b91acb5f526c3ab777518137 · sha256:b7429234f9854aed… · /containers/cna/references/2

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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