CVE-2026-8505 in Langflow OSS
Summary
by MITRE • 07/17/2026
IBM Langflow OSS 1.0.0 through 1.10.0 has a vulnerability in Langflow's webhook authentication logic allows unauthenticated users to trigger the execution of any flow. The system incorrectly bypasses API key validation when the WEBHOOK_AUTH_ENABLE configuration is set to False (which is the default setting). This allows a remote attacker who knows a flow's UUID to execute it as if they were the owner, potentially leading to Remote Code Execution (RCE).
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Analysis
by VulDB Data Team • 07/18/2026
This vulnerability exists within IBM Langflow Open Source Software versions 1.0.0 through 1.10.0 where the webhook authentication mechanism contains a critical design flaw that permits unauthorized execution of flows. The system's default configuration with WEBHOOK_AUTH_ENABLE set to False creates an inherent security weakness that bypasses proper API key validation processes. When this setting is disabled, the application fails to authenticate incoming webhook requests, allowing any remote attacker with knowledge of a flow's universally unique identifier to execute arbitrary workflows without proper authorization. This represents a fundamental breakdown in the principle of least privilege and authentication controls that should protect sensitive system operations.
The technical implementation flaw stems from improper conditional logic within the authentication validation process where the system does not adequately verify credentials when webhook authentication is disabled. This misconfiguration creates an attack surface that aligns with CWE-287, which addresses improper authentication vulnerabilities, and specifically manifests as a weakness in credential handling and access control mechanisms. The vulnerability operates at the application layer and can be exploited through network-based attacks without requiring any prior authentication or session establishment. Attackers need only discover a valid flow UUID to execute malicious payloads through the webhook endpoint.
The operational impact of this vulnerability extends beyond simple unauthorized access to potentially enable full remote code execution capabilities within the Langflow environment. An attacker could leverage this weakness to execute arbitrary commands on the system hosting the Langflow application, particularly if flows are configured to interact with external systems or perform system-level operations. This scenario represents a significant escalation from basic privilege bypass to potential system compromise, aligning with ATT&CK technique T1059 for command and scripting interpreter usage and potentially T1078 for valid accounts usage. The default insecure configuration means that organizations deploying this software without proper security hardening are immediately vulnerable.
Organizations should immediately implement mitigations by setting WEBHOOK_AUTH_ENABLE to True in their Langflow configuration files, ensuring proper API key validation occurs for all webhook requests. Additionally, network segmentation and firewall rules should be implemented to restrict access to webhook endpoints from trusted sources only. Regular monitoring of flow execution logs should be enabled to detect unauthorized activity patterns, while implementing rate limiting on webhook endpoints can help prevent abuse. The remediation strategy must also include comprehensive security assessments of existing deployments and proper configuration management practices to ensure that default insecure settings are not left in place. Organizations should consider implementing authentication tokens or API keys for all webhook integrations and conduct regular vulnerability scanning to identify any similar misconfigurations within their infrastructure.