GHSA-2x8m-83vc-6wv4: Flowise: SSRF Protection Bypass (TOCTOU & Default Insecure)

April 16, 2026 (updated April 18, 2026)

The core security wrappers (secureAxiosRequest and secureFetch) intended to prevent Server-Side Request Forgery (SSRF) contain multiple logic flaws. These flaws allow attackers to bypass the allow/deny lists via DNS Rebinding (Time-of-Check Time-of-Use) or by exploiting the default configuration which fails to enforce any deny list.

References

github.com/FlowiseAI/Flowise
github.com/FlowiseAI/Flowise/security/advisories/GHSA-2x8m-83vc-6wv4
github.com/advisories/GHSA-2x8m-83vc-6wv4

Code Behaviors & Features

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