CVE-2026-107366
Published:October 19, 2026
Updated:October 20, 2026
IBM Langflow OSS 1.0.0 through 1.12.4 contains three message endpoints that perform no ownership verification. Any authenticated user can bulk-delete another user's messages, overwrite message content to inject malicious prompts, or hijack an entire conversation session by reassigning its session ID.
Affected Packages
https://github.com/langflow-ai/langflow.git (GITHUB):
Affected version(s) >=v1.0.0a47 <v1.9.0Fix Suggestion:
Update to version v1.9.0langflow-base-nightly (PYTHON):
Affected version(s) >=1.7.0.dev0 <1.9.0.dev23Fix Suggestion:
Update to version 1.9.0.dev23langflow-base (PYTHON):
Affected version(s) >=0.0.58 <0.9.0Fix Suggestion:
Update to version 0.9.0Related Resources (1)
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Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
LOW
User Interaction
NONE
Vulnerable System Confidentiality
HIGH
Vulnerable System Integrity
HIGH
Vulnerable System Availability
LOW
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
8.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
LOW
Weakness Type (CWE)
Authorization Bypass Through User-Controlled Key