IBM Langflow OSS Credential Exposure Vulnerability

Executive Summary

IBM Langflow OSS versions 1.0.0 through 1.11.2 have a flaw where sensitive credential fields are not fully scrubbed from public flows. This allows unauthenticated users to access secrets like Authentication tokens, X-Session-Id, App-Key, and JWT if they know the public flow identifier and the flow owner's user identifier.

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Detection Guidance

To detect CVE-2026-19300, check if your Langflow OSS version is between 1.0.0 and 1.11.2. Verify if public flows expose sensitive credential fields like Authentication, X-Session-Id, App-Key, or JWT. Inspect network traffic for unauthorized access to these fields using tools like curl or Wireshark to query public flow endpoints.

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Impact Analysis

An attacker could exploit this to steal sensitive credentials, leading to unauthorized access to systems or data protected by those credentials. This could result in data breaches, account takeovers, or further lateral movement within affected environments.

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Compliance Impact

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

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Mitigation Strategies

Upgrade Langflow OSS to version 1.11.3 or later immediately. Ensure all public flows are reviewed for exposed sensitive credentials. Restrict access to flow identifiers and user identifiers to prevent unauthorized access. Monitor for any signs of exploitation.

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