---
cve: "CVE-2026-56278"
severity: "CRITICAL"
cvss: 9.3
epss: "37%"
vendor: "Flowise"
kev: false
exploited: false
published: "2026-06-30 23:17:29"
tags: [cve, security, critical]
source: tsecurity.de CVE-Dossier
exported: "2026-09-17T06:07:03+02:00"
---

# CVE-2026-56278

> 9.3 CRITICAL · 🧪 PoC

## Beschreibung

Flowise before 3.1.0 (affected versions 3.0.13 and earlier) uses a weak hardcoded default secret ('flowise') for the express-session middleware when the EXPRESS_SESSION_SECRET environment variable is not set (packages/server/src/enterprise/middleware/passport/index.ts). Because this default secret is publicly visible in the source code, an attacker can forge valid signed session cookies to impersonate any user and bypass authentication.

## CVSS-Vektor

```
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
```

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

## Patch verfügbar (OSV)

- 378d3ec3bd2d4157d6aa694bbc5ffa50c4159b97 (Commit)

## Referenzen

- <https://github.com/FlowiseAI/Flowise/security/advisories/GHSA-2qqc-p94c-hxwh>
- <https://www.vulncheck.com/advisories/flowise-session-hijacking-via-weak-default-express-session-secret>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-56278) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_