CVE-2026-6542 PUBLISHED

Monitor API allows cross-user read of transaction logs and deletion of build data via flow_id

Assigner: ibm
Reserved: 17.04.2026 Published: 30.04.2026 Updated: 30.04.2026

IBM Langflow OSS 1.0.0 through 1.8.4 could allow any user to supply a flow_id to read transaction logs and vertex build data belonging to other users, and to delete persisted vertex build data for another user's flow.

Metrics

CVSS 3.1

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
CVSS Score: 6.5

Attack Vector	Network	Scope	Unchanged
Attack Complexity	Low	Confidentiality Impact	High
Privileges Required	Low	Integrity Impact	None
User Interaction	None	Availability Impact	None

CVSS 3.1

Product Status

Vendor	IBM
Product	Langflow OSS
Versions	affected from 1.0.0 to 1.8.4 (incl.)

Solutions

IBM recommends addressing the vulnerability now by upgrading to Langflow OSS 1.9.0 or newer: https://github.com/langflow-ai/langflow

References

https://www.ibm.com/support/pages/node/7270886

Problem Types

CWE-639 Authorization Bypass Through User-Controlled Key CWE