CVE-2026-56271 Flowise CVE debrief

Who should care

Administrators and users of Flowise versions 3.0.13 and earlier should prioritize patching to prevent authentication bypass attacks. This vulnerability has a critical CVSS score of 9.3 and allows for authentication bypass. Security teams and vulnerability management teams should review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance.

Technical summary

Flowise before 3.1.0 uses weak hardcoded default JWT secrets and audience and issuer values in its enterprise passport authentication middleware. When environment variables are not set, the application falls back to these publicly known defaults, allowing attackers to forge valid JWTs and impersonate any user, including administrators. This vulnerability has a critical CVSS score of 9.3 and allows for authentication bypass. The application silently falls back to these publicly known defaults when the corresponding environment variables (JWT_AUTH_TOKEN_SECRET, JWT_REFRESH_TOKEN_SECRET, JWT_AUDIENCE, JWT_ISSUER) are not set.

Defensive priority

High priority due to critical CVSS score of 9.3 and potential for authentication bypass

Recommended defensive actions

• Apply patches or upgrade to Flowise version 3.1.0 or later
• Set environment variables for JWT secrets and audience and issuer values
• Monitor for suspicious authentication activity
• Implement additional authentication and authorization controls
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

Evidence is based on limited source detail; further verification is recommended. Official CVE and NVD records provide some context. The CVE record was published on 2026-07-12T12:16:45.290Z and has not been modified since then. The Flowise application uses weak hardcoded default JWT secrets and audience and issuer values in its enterprise passport authentication middleware. When environment variables are not set, the application falls back to these publicly known defaults, allowing attackers to forge valid JWTs and impersonate any user, including administrators. Administrators and users of Flowise versions 3.0.13 and earlier should prioritize patching to prevent authentication bypass attacks.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.