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CVE-2026-58057

Flowise before 3.1.3 validates Custom MCP stdio environment variables against a denylist using a case-sensitive comparison, so on Windows, where environment names are case-insensitive, supplying 'node_options' bypasses the NODE_OPTIONS denylist entry. An authenticated user who can configure a Custom MCP node can thereby inject NODE_OPTIONS --require and execute arbitrary code in the Flowise server context.
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:1ecf638aa1aeadf0ccdfe63652f5e634a2dc58767a3465798a32e42926879eb1
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
1

Preserved source conflicts

No provider value was silently selected as the winner.

cvss · 2 assertions

{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.3,"baseSeverity":"LOW","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:63d65e3ac2b7742c5e82bb8dcab7b0dceb88361a5b5a94437693a49a0e03fe30 · sha256:25cecf1c6c7c5b92… · /containers/cna/metrics/1/cvssV4_0

{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}

  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:63d65e3ac2b7742c5e82bb8dcab7b0dceb88361a5b5a94437693a49a0e03fe30 · sha256:25cecf1c6c7c5b92… · /containers/cna/metrics/0/cvssV3_1

Affected products and versions

1 source assertion
{"defaultStatus":"unaffected","packageURL":"pkg:npm/flowise","product":"Flowise","vendor":"Flowise","versions":[{"lessThan":"3.1.3","status":"affected","version":"0","versionType":"semver"},{"status":"unaffected","version":"3.1.3","versionType":"semver"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:63d65e3ac2b7742c5e82bb8dcab7b0dceb88361a5b5a94437693a49a0e03fe30 · sha256:25cecf1c6c7c5b92… · /containers/cna/affected/0

Provider-owned CVSS observations

2 source assertions
{"metric":{"attackComplexity":"HIGH","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":2.3,"baseSeverity":"LOW","privilegesRequired":"LOW","subAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","userInteraction":"NONE","vectorString":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N","version":"4.0","vulnAvailabilityImpact":"LOW","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"LOW"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:63d65e3ac2b7742c5e82bb8dcab7b0dceb88361a5b5a94437693a49a0e03fe30 · sha256:25cecf1c6c7c5b92… · /containers/cna/metrics/1/cvssV4_0
{"metric":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"LOW","baseScore":5,"baseSeverity":"MEDIUM","confidentialityImpact":"LOW","integrityImpact":"LOW","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L","version":"3.1"},"metric_type":"cvssV3_1"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:63d65e3ac2b7742c5e82bb8dcab7b0dceb88361a5b5a94437693a49a0e03fe30 · sha256:25cecf1c6c7c5b92… · /containers/cna/metrics/0/cvssV3_1

CWE assertions

1 source assertion
{"cweId":"CWE-178","description":"Improper Handling of Case Sensitivity","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:63d65e3ac2b7742c5e82bb8dcab7b0dceb88361a5b5a94437693a49a0e03fe30 · sha256:25cecf1c6c7c5b92… · /containers/cna/problemTypes/0/descriptions/0

Source references

3 source assertions
{"name":"Fix (PR #6471, 3.1.3)","tags":["issue-tracking"],"url":"https://github.com/FlowiseAI/Flowise/pull/6471"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:63d65e3ac2b7742c5e82bb8dcab7b0dceb88361a5b5a94437693a49a0e03fe30 · sha256:25cecf1c6c7c5b92… · /containers/cna/references/1
{"name":"Proof of Concept","tags":["exploit","third-party-advisory"],"url":"https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-poc"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:63d65e3ac2b7742c5e82bb8dcab7b0dceb88361a5b5a94437693a49a0e03fe30 · sha256:25cecf1c6c7c5b92… · /containers/cna/references/0
{"name":"VulnCheck Advisory: Flowise - Custom MCP Environment Variable Denylist Bypass via Case Sensitivity","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivity"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:63d65e3ac2b7742c5e82bb8dcab7b0dceb88361a5b5a94437693a49a0e03fe30 · sha256:25cecf1c6c7c5b92… · /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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