CVE-2026-56271criticalobserved exploitationCWE-321

CVE-2026-56271: critical vulnerability in Flowise

Flowise - Weak Default JWT Secrets in Authentication Middleware

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50Vexday Risk Score

Prioritize patching. It exploitation observed by VulnCheck.

ssvc Actcvss 9.3epss 0.7%
from disclosure to weapon
Published on NVDJul 12
VulnCheck+71d
Flowise before 3.1.0 (affected versions 3.0.13 and earlier) uses weak hardcoded default JWT secrets ('auth_token', 'refresh_token') and default audience and issuer values ('AUDIENCE', 'ISSUER') in the enterprise passport authentication middleware (packages/server/src/enterprise/middleware/passport/index.ts). When the corresponding environment variables (JWT_AUTH_TOKEN_SECRET, JWT_REFRESH_TOKEN_SECRET, JWT_AUDIENCE, JWT_ISSUER) are not set, the application silently falls back to these publicly known defaults, allowing an attacker to forge valid JWTs and impersonate any user, including administrators, resulting in authentication bypass.
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Affected products
Flowise · Flowise
Related CVEs — Flowise

In the same product, most dangerous first.

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