CVE-2026-8446: IBM Langflow OSS 1.0.0 through 1.10.3 contain an authentication bypass vulnerability in the Model Context Protocol (MCP)
Summary
IBM Langflow OSS versions 1.0.0 through 1.10.3 have an authentication bypass vulnerability in the Model Context Protocol (MCP, a system for connecting AI models to external tools) composer endpoint when certain settings are enabled. This means attackers could potentially access protected features without proper login credentials when mcp_composer_enabled is set to true and projects use oauth (a login method) for authentication.
Vulnerability Details
7.5(high)
EPSS: 0.0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
network
low
none
none
August 5, 2026
Classification
Affected Vendors
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Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-8446
First tracked: August 5, 2026 at 02:07 PM
Classified by LLM (prompt v3) · confidence: 85%