CVE-2026-8446 IBM CVE debrief

Who should care

IBM Langflow OSS users and administrators, as well as security teams and vulnerability management teams, should verify affected versions and configurations. They should implement mitigations or patches as necessary to prevent exploitation of the authentication bypass vulnerability. Additionally, operators and platform administrators should review system configurations and ensure that proper security controls are in place to mitigate potential impacts.

Technical summary

The Model Context Protocol (MCP) composer endpoint in IBM Langflow OSS 1.0.0 through 1.10.3 has an authentication bypass vulnerability when mcp_composer_enabled=true (default) and projects are configured with auth_type=oauth . This vulnerability allows unauthorized access to affected systems, potentially leading to data breaches or system compromise.

Defensive priority

High priority due to authentication bypass vulnerability

Recommended defensive actions

• Inventory and verify affected IBM Langflow OSS versions
• Check if projects are configured with auth_type=oauth and mcp_composer_enabled=true
• Implement compensating controls to mitigate authentication bypass
• Monitor for vendor remediation and apply patches
• Exception tracking and retest as necessary

Evidence notes

IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer endpoint when mcp_composer_enabled=true (default) and projects are configured with auth_type=oauth . Evidence from IBM and NVD indicates an authentication bypass vulnerability exists. Further investigation is needed to determine affected scope, vendor remediation, and potential mitigations.

Official resources