CVE-2026-8446: Langflow is affected by security vulnerabilities in Model Context Protocol features
IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Protocol (MCP) composer endpoint when mcpcomposerenabled=true (default) and projects are configured with authtype=oauth .
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
IBM Langflow OSSto a version that resolves this vulnerability.Fixed in 1.11.0
Event History
Frequently Asked Questions
What is the severity of CVE-2026-8446?
The severity of CVE-2026-8446 is rated as high, with a score of 7.5.
What vulnerability is described in CVE-2026-8446?
CVE-2026-8446 describes an authentication bypass vulnerability in the Model Context Protocol features of IBM Langflow OSS.
Can CVE-2026-8446 be exploited remotely?
Yes, CVE-2026-8446 can be exploited remotely as it allows unauthorized access through insecure configurations.
How do I fix CVE-2026-8446?
To fix CVE-2026-8446, disable the mcp_composer_enabled feature or reconfigure projects to use a different authentication type than oauth.
Which versions of IBM Langflow OSS are affected by CVE-2026-8446?
IBM Langflow OSS versions 1.0.0 through 1.10.3 are affected by CVE-2026-8446.