CVE-2026-55255: Langflow: IDOR Vulnerability in `/api/v1/responses` Endpoint Allows Authenticated Attackers to Access Another User's Flow

June 19, 2026

Insecure Direct Object Reference (IDOR) vulnerability in /api/v1/responses endpoint allows an authenticated attacker to execute any flow belonging to another user by specifying the victim’s flow ID in the request.

References

github.com/advisories/GHSA-qrpv-q767-xqq2
github.com/langflow-ai/langflow/pull/12832
github.com/langflow-ai/langflow/security/advisories/GHSA-qrpv-q767-xqq2
nvd.nist.gov/vuln/detail/CVE-2026-55255

Code Behaviors & Features

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