Improper Ownership Validation in IBM Langflow OSS Affects Multiple Versions
CVE-2026-10547

5.9MEDIUM

Key Information:

Vendor

IBM
Status
Langflow Oss
Vendor
CVE Published:
5 August 2026

What is CVE-2026-10547?

IBM Langflow OSS versions 1.0.0 through 1.10.3 are affected by a vulnerability in the deprecated POST /api/v1/build/{flow_id}/vertices endpoint. This issue arises from improper validation of ownership, enabling authenticated users to inject arbitrary graph data into a shared cache. The implications of this weakness include potential cross-user cache pollution, which can lead to unauthorized execution of workflows and possible denial of service, impacting the integrity and availability of the application.

Affected Version(s)

Langflow OSS 1.0.0 <= 1.10.3

References

https://www.ibm.com/support/pages/node/7282647
vendor-advisorypatch

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Sergio Cabrera (ddlxstudio) https://github.com/nekros1xx
.