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CVE-2026-56271 is a critical authentication bypass vulnerability in Flowise affecting versions prior to 3.1.0, including 3.0.13 and earlier. The flaw resides in the enterprise passport authentication middleware, where JWT signing secrets and token validation parameters are sourced from environment variables but silently fall back to hardcoded default values when those variables are unset. Specifically, the middleware accepts predictable built-in defaults for the authentication token secret, refresh token secret, audience, and issuer instead of failing securely. Because these values are publicly known and static, a remote attacker can generate forged JWTs that satisfy the application's verification logic and impersonate arbitrary users, including administrators. The vulnerable logic is located in the enterprise passport middleware implementation under packages/server/src/enterprise/middleware/passport/index.ts.
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A critical authentication bypass vulnerability in Flowise caused by hardcoded default JWT secrets and default audience/issuer values in enterprise authentication middleware, allowing unauthenticated attackers to forge valid JWTs and impersonate any user, including administrators.
A critical authentication bypass vulnerability in Flowise caused by weak hardcoded default JWT secrets and default audience/issuer values, enabling attackers to forge JWTs and impersonate users, including administrators.
A critical authentication bypass vulnerability in Flowise Enterprise Passport middleware caused by hardcoded default JWT secrets and identifiers, allowing remote unauthenticated attackers to forge tokens and gain administrative access.
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