# CVE-2026-127214: Flowise 3.1.4 SSRF Bypass via Custom Function Sandbox

Status: published. Published: 2026-11-13. Updated: 2026-11-13.

Flowise through 3.1.4 contains a server-side request forgery vulnerability that allows authenticated attackers with chatflows or agentflows create/update permissions to bypass the Custom Function sandbox's SSRF protection by requiring a module subpath inside an allowlisted package, such as axios/dist/node/axios.cjs or node-fetch/lib/index.js, which evades the vm2 mock table and returns an unwrapped HTTP client that skips the checkDenyList validation. Attackers can issue arbitrary GET and POST requests with attacker-controlled bodies via POST /api/v1/node-custom-function to reach loopback and internal-network addresses or the cloud metadata endpoint, enabling network mapping, credential disclosure, and state changes on internal services.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- FlowiseAI / Flowise (FlowiseAI/Flowise): ≥ 0; ≤ 3.1.4 (affected, semver). Source: CNA: VulnCheck

## Severity and prioritization

- CVSS 4.0: 6.3 (medium); CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:H/SI:L/SA:N; source: CNA: VulnCheck

- CVSS 3.1: 8.5 (high); CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N; source: CNA: VulnCheck

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: CWE-918

## Exploit evidence

- exploit: https://github.com/soovwv/cve/blob/main/research/flowise-ssrf-bypass-via-subpath-import.md (CNA: VulnCheck)

## References

- https://github.com/soovwv/cve/blob/main/research/flowise-ssrf-bypass-via-subpath-import.md (CNA: VulnCheck; technical-description, exploit)

- https://www.vulncheck.com/advisories/flowise-ssrf-bypass-via-custom-function-sandbox (CNA: VulnCheck; third-party-advisory)

## Provenance

- CNA: VulnCheck: https://www.cve.org/CVERecord?id=CVE-2026-127214; retrieved 2026-11-13; source updated 2026-11-13

Revision: 83b3c1ca641d91e6d0077cb0405aa6ada8dbb51a3ceb605168601fe1d7d18131

Canonical: https://y2.dev/cve/CVE-2026-127214

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