CVE-2026-18891

Analyzed Analyzed - Analysis Complete

Remote Code Execution in IBM Langflow OSS

Publication date: 2026-08-28

Last updated on: 2026-08-31

Assigner: IBM Corporation

Description

IBM Langflow OSS 1.0.0 through 1.11.1 could allow a remote attacker to execute arbitrary flows and access sensitive information due to improper authentication.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-28

Last Modified

2026-08-31

Generated

2026-09-19

AI Q&A

2026-08-29

EPSS Evaluated

2026-09-15

NVD

CVE-2026-18891

EUVD

EUVD-2026-67953

Affected Vendors & Products

Vendor	Product	Version / Range
langflow	langflow	From 1.0.0 (inc) to 1.11.2 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-287	When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Attack-Flow Graph

Executive Summary

IBM Langflow OSS versions 1.0.0 through 1.11.1 have an improper authentication vulnerability. This allows a remote attacker to execute arbitrary flows and access sensitive information without proper authorization.

Detection Guidance

This vulnerability involves improper authentication in IBM Langflow OSS versions 1.0.0 through 1.11.1, allowing remote attackers to execute arbitrary flows and access sensitive information. Detection requires checking for unauthorized flow executions or unusual network traffic patterns. Review server logs for unexpected access attempts or flow activations. Ensure authentication mechanisms are properly configured and restrict network access to trusted sources only.

Impact Analysis

An attacker could exploit this to run unauthorized flows, potentially accessing or manipulating sensitive data. This could lead to data breaches, unauthorized actions, or further network compromise depending on the system's configuration.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating GDPR's data protection principles or HIPAA's security requirements. Organizations may face compliance violations, legal penalties, and reputational damage.

Mitigation Strategies

Update IBM Langflow OSS to a version beyond 1.11.1 to address improper authentication. Ensure all flows are properly authenticated and restrict access to sensitive information.

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