CVE-2026-110245 in Langflow OSS
Summary
by MITRE • 10/29/2026
IBM Langflow OSS 1.0.0 through 1.12.4 could allow a remote attacker to obtain sensitive information due to improper authentication.
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Analysis
by VulDB Data Team • 10/29/2026
The vulnerability identified in IBM Langflow versions 1.0.0 through 1.12.4 represents a critical failure in access control mechanisms, specifically categorized under CWE-306: Missing Authentication for Critical Function. This flaw allows remote attackers to bypass intended security restrictions and obtain sensitive information that should be protected by authentication protocols. The root cause lies in the application's handling of session management or API endpoints where authorization checks are either absent or improperly implemented. In a typical secure architecture, every request accessing user-specific data or administrative functions must validate the identity of the requester against stored credentials or tokens. However, in these affected versions of Langflow, certain endpoints do not enforce this validation rigorously, leaving them accessible to unauthenticated users over the network.
From an operational perspective, this misconfiguration enables unauthorized entities to interact with the application as if they were legitimate users. The primary impact is the exposure of sensitive data, which may include personal identifiable information, configuration details, or proprietary logic embedded within Langflow workflows. Since Langflow is often used for building and managing large language model applications, the exposed data could also reveal insights into internal processes, third-party integrations, or API keys that facilitate connections to other services. This level of access effectively compromises the confidentiality integrity of the system, allowing attackers to scrape data without detection in many scenarios due to the lack of anomalous login patterns associated with brute force attacks.
The exploitation vector for this vulnerability aligns closely with ATT&CK technique T1078: Valid Accounts, although it specifically targets the absence of authentication rather than stolen credentials. Attackers can automate requests to enumerate and extract data from vulnerable endpoints using standard HTTP methods such as GET or POST. Because no valid session token is required, simple scripting tools can be employed to harvest information at scale. This poses a significant risk in environments where Langflow is deployed publicly or within networks that are not strictly segmented, as the attack requires only network connectivity and does not necessitate prior compromise of user accounts.
Mitigation strategies must focus on immediate patching and rigorous review of access control policies. The most effective remediation is to upgrade IBM Langflow to a version later than 1.12.4 where these authentication gaps have been addressed by the vendor. For systems that cannot be immediately updated, network-level controls such as Web Application Firewalls should be configured to restrict access to sensitive endpoints based on IP reputation or known attack patterns. Additionally, developers and administrators must audit custom integrations and API configurations within Langflow to ensure that all data retrieval functions enforce strict authentication checks. Regular security assessments and penetration testing are recommended to verify that no similar misconfigurations exist in other parts of the application stack.