CVE-2026-18891
8.2IBM · Langflow OSS
IBM Langflow OSS contains an improper authentication vulnerability that allows unauthenticated remote attackers to execute arbitrary flows and access sensitive information.
Executive summary
A critical authentication bypass in IBM Langflow OSS allows unauthenticated remote attackers to execute unauthorized flows and access sensitive data, posing a severe risk to system integrity.
Vulnerability
This vulnerability is caused by improper authentication within the application, allowing an unauthenticated remote attacker to interact with the system without providing valid credentials. The flaw specifically enables the execution of arbitrary flows and unauthorized access to sensitive information stored or processed by the platform.
Business impact
The ability for an unauthenticated user to execute arbitrary flows could lead to full compromise of the application logic and unauthorized exfiltration of sensitive organizational data. Given the CVSS score of 8.2, this high-severity vulnerability presents a significant risk to operational security, potentially resulting in data breaches and loss of intellectual property.
Remediation
Immediate Action: Upgrade IBM Langflow OSS to version 1.11.2 or later immediately to resolve the authentication bypass.
Proactive Monitoring: Review access logs for unusual patterns or unrecognized flow execution requests originating from external IP addresses.
Compensating Controls: Implement strict network-level access controls to restrict exposure of the Langflow interface to trusted networks only, effectively limiting the reach of potential unauthenticated attackers.
Exploitation status
Public Exploit Available: Unknown
Analyst recommendation
The severity of this flaw necessitates immediate attention from IT and security teams. Administrators must prioritize upgrading to version 1.11.2 to secure the environment against unauthorized flow execution and data exposure. Failure to patch may leave the application exposed to remote exploitation.