Message Endpoint Vulnerability in IBM Langflow OSS
CVE-2026-107366

8.3HIGH

Key Information:

Vendor

IBM
Status
Langflow Oss
Vendor
CVE Published:
19 October 2026

What is CVE-2026-107366?

IBM Langflow OSS versions 1.0.0 through 1.12.4 are susceptible to a vulnerability involving message endpoints that fail to verify ownership. This oversight allows any authenticated user to delete messages from other users, modify message content with potentially malicious prompts, and even take over ongoing conversation sessions by changing the session IDs. These weaknesses could lead to significant security breaches and unauthorized access to sensitive user communications.

Affected Version(s)

Langflow OSS 1.0.0 <= 1.12.4

References

https://www.ibm.com/support/pages/node/7293016
vendor-advisorypatch

CVSS V3.1

Score:
8.3
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.