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CVE-2026-40933

🗓️ 21 Apr 2026 21:00:35Reported by GitHub_MType 
cve
 cve
🔗 web.nvd.nist.gov📰️ 6 Media mentions👁 295 Views🌐 WEB

Authenticated RCE in Flowise MCP adapters due to unsafe stdio serialization; fixed in 3.1.0.

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Detection
Affected
Refs
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Social
ReporterTitlePublishedViews
Family
attackerkb
attackerkb
CVE-2026-40933
21 Apr 202621:00
–attackerkb
circl
Circl
CVE-2026-40933
16 Apr 202621:18
–circl
cnnvd
CNNVD
Flowise operating system command injection vulnerability
21 Apr 202600:00
–cnnvd
cvelist
Cvelist
CVE-2026-40933 Flowise: Authenticated RCE Via MCP Adapters
21 Apr 202621:00
–cvelist
github
Github Security Blog
Flowise: Authenticated RCE Via MCP Adapters
16 Apr 202621:18
–github
mend
Mend
CVE-2026-40933
21 Apr 202621:00
–mend
nvd
NVD
CVE-2026-40933
21 Apr 202622:16
–nvd
osv_cve
osv_cve
CVE-2026-40933 Flowise: Authenticated RCE Via MCP Adapters
21 Apr 202621:00
–osv_cve
osv_ghsa
osv_ghsa
GHSA-C9GW-HVQQ-F33R Flowise: Authenticated RCE Via MCP Adapters
16 Apr 202621:18
–osv_ghsa
ptsecurity
Positive Technologies
PT-2026-33361
16 Apr 202600:00
–ptsecurity
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NVD
Vulners
Node
flowiseaiflowiseRange<3.1.0
[
  {
    "vendor": "FlowiseAI",
    "product": "Flowise",
    "versions": [
      {
        "version": "< 3.1.0",
        "status": "affected"
      }
    ]
  },
  {
    "vendor": "FlowiseAI",
    "product": "flowise-components",
    "versions": [
      {
        "version": "< 3.1.0",
        "status": "affected"
      }
    ]
  }
]
ParameterPositionPathDescriptionCWE
Custom MCP configurationrequest body/canvasUnsafe serialization of stdio commands in the MCP adapter allows an authenticated attacker to add an MCP stdio server with an arbitrary command, leading to command execution.CWE-78

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26 Oct 2026 22:10Current
6.8Medium risk
Vulners AI Score6.8
CVSS 3.19.9
EPSS0.11964
SSVC
295