Authentication Bypass in IBM Langflow OSS Affects Multiple Versions
CVE-2026-8446

7.5HIGH

Key Information:

Vendor

IBM
Status
Langflow Oss
Vendor
CVE Published:
5 August 2026

What is CVE-2026-8446?

IBM Langflow OSS versions 1.0.0 through 1.10.3 are susceptible to an authentication bypass due to a flaw in the Model Context Protocol (MCP) composer endpoint. This vulnerability is triggered when the mcp_composer_enabled setting is set to true (the default state) and projects are configured with auth_type set to oauth. Exploitation of this vulnerability allows unauthorized access, potentially compromising sensitive data and system integrity.

Affected Version(s)

Langflow OSS 1.0.0 <= 1.10.3

References

https://www.ibm.com/support/pages/node/7282147
vendor-advisorypatch

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

CVEs reported to IBM: CVE-2026-8446 by odgrso (GMO CyberSecurity by Ierae, Inc.); CVE-2026-17626 by Thai Son Dinh (VinSOC Labs, (R&amp;D).
.