CVE-2025-34291: Langflow account takeover and remote code execution via CORS and refresh token

Summary

Langflow versions up to and including 1.6.9 contain a chained flaw tracked as CVE-2025-34291. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie set to SameSite=None lets a malicious webpage call the refresh endpoint with the victim's credentials. The attacker obtains fresh access_token and refresh_token pairs, which grant access to authenticated endpoints, including built-in code-execution functionality, enabling arbitrary code execution and full system compromise.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Affected packages in the Exposure Registry

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

• langflowPyPIReaches an LLM package through dependencies

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