CVE-2025-71336: Unsandboxed remote code execution in Flowise Custom MCP

# CVE-2025-71336: Unsandboxed remote code execution in Flowise Custom MCP

https://gcdradar.vercel.app/incidents/cve-2025-71336-unsandboxed-remote-code-execution-in-flowise · AIR-2026-0029 · closed 2026-06-25

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Patched
- First reported: 2026-06-25
- AI role: Attack on AI
- Products: Flowise
- CVE ids: CVE-2025-71336
- CVSS: 9.8

## Summary

Flowise features an unsandboxed remote code execution vulnerability within its Custom MCP feature due to minimal authentication controls. Attackers can send crafted JSON payloads to execute OS commands.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Affected and fixed versions

- Affected: flowise >= 2.2.7-patch.1, < 3.0.6
- Fixed in: flowise 3.0.6

## Latest updates

- 2026-06-26: GitHub advisory published (https://github.com/advisories/GHSA-q2xp-j85q-883h)
- 2026-06-25: CVE-2025-71336: Flowise before 3.0.6 (affected versions 2.2.7-patch.1 and earlier) contains an unsandboxed remote code execution vulnerability in… (https://nvd.nist.gov/vuln/detail/CVE-2025-71336)

## Sources

- 2026-06-25 NVD: CVE-2025-71336: Flowise before 3.0.6 (affected versions 2.2.7-patch.1 and earlier) contains an unsandboxed remote code execution vulnerability in… https://nvd.nist.gov/vuln/detail/CVE-2025-71336
- 2026-06-26 GitHub Advisory Database: GHSA-q2xp-j85q-883h: Duplicate Advisory: Flowise has unsandboxed remote code execution via Custom MCP https://github.com/advisories/GHSA-q2xp-j85q-883h

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.