Webhook Authentication Flaw in IBM Langflow OSS Products
CVE-2026-8505

9.8CRITICAL

Key Information:

Vendor

IBM
Status
Langflow Oss
Vendor
CVE Published:
17 July 2026

What is CVE-2026-8505?

IBM Langflow Open Source Software versions 1.0.0 through 1.10.0 contain a vulnerability in the webhook authentication mechanism. This flaw allows unauthenticated users to trigger the execution of any defined flow. The issue arises from the improper handling of API key validation when the WEBHOOK_AUTH_ENABLE setting is disabled, which is the default configuration. With knowledge of a flow's UUID, an attacker can execute flows as if they were the rightful owner, potentially leading to unauthorized actions and Remote Code Execution risks.

Affected Version(s)

Langflow OSS 1.0.0 <= 1.10.0

References

https://www.ibm.com/support/pages/node/7278921
vendor-advisorypatch

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Edward-x (YLChen-007)
.