---
cve: "CVE-2026-58057"
severity: "LOW"
cvss: 2.3
epss: "1.3%"
vendor: "Flowise"
kev: false
exploited: false
published: "2026-06-28 02:16:32"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-08T10:35:46+02:00"
---

# CVE-2026-58057

> 2.3 LOW · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
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
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Hoch | good |
| PR Privilegien | Gering | warn |
| UI Interaktion | Keine | bad |

## Exploit-Evidenz

- [EDB-52623 — Flowise  3.1.3 - arbitrary code execution](https://www.exploit-db.com/exploits/52623)

## Patch verfügbar (OSV)

- 09f099dbfda179e439ec677d06ad737375899eef (Commit)

## Referenzen

- <https://github.com/bikini/exploitarium/tree/main/flowise-mcp-env-case-bypass-poc>
- <https://github.com/FlowiseAI/Flowise/pull/6471>
- <https://www.vulncheck.com/advisories/flowise-custom-mcp-environment-variable-denylist-bypass-via-case-sensitivity>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-58057) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_