CVE-2026-101329 in Langflow OSS
Summary
by MITRE • 10/07/2026
IBM Langflow OSS 1.0.0 through 1.12.2 could allow a remote authenticated attacker to obtain sensitive information due to improper access control.
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Analysis
by VulDB Data Team • 10/07/2026
The vulnerability identified in IBM Langflow versions 1.0.0 through 1.12.2 represents a critical failure in the application's authorization logic, specifically categorized under CWE-284 Improper Access Control. This flaw allows remote authenticated attackers to bypass intended security restrictions and access sensitive information that should be restricted to authorized users or administrative roles. The core technical issue stems from insufficient validation of user permissions when processing requests for specific API endpoints or data resources within the Langflow platform. While authentication mechanisms successfully verify the identity of a user, the subsequent authorization checks fail to ensure that the authenticated entity possesses the requisite privileges to access the requested resource. This discrepancy creates an opportunity for privilege escalation and unauthorized data retrieval, undermining the confidentiality guarantees provided by the application's security model.
From an operational perspective, this vulnerability poses significant risks to organizations deploying Langflow for machine learning workflow orchestration or AI agent development. Since authenticated users can exploit improper access controls, they may retrieve sensitive configuration details, internal API keys, user credentials stored in session data, or proprietary logic embedded within workflows. The impact extends beyond simple information disclosure; it facilitates further attacks such as credential stuffing if passwords are exposed, or lateral movement within a network if internal service endpoints become accessible without proper isolation. Attackers can leverage these capabilities to map the application's architecture and identify additional attack vectors, potentially leading to complete system compromise depending on the sensitivity of the leaked data and the integration points with other enterprise systems.
This type of vulnerability aligns closely with MITRE ATT&CK technique T1078 Valid Accounts, where adversaries use legitimate credentials to gain access to resources they are not authorized to view. It also relates to CWE-639 Authorization Bypass Through User-Controlled Key, as the attacker likely manipulates identifiers or parameters in API requests to target objects belonging to other users or higher privilege levels. The absence of robust object-level authorization checks means that once a user is authenticated, they can traverse resources indiscriminately if the application relies solely on session existence rather than explicit permission verification for each action. This lack of granular access control violates fundamental principles of least privilege and separation of duties essential in secure software design.
To mitigate this vulnerability, organizations must immediately upgrade IBM Langflow to version 1.12.3 or later, where these authorization checks have been corrected. In the interim, if upgrading is not feasible, administrators should implement strict network segmentation to limit access to Langflow instances only from trusted IP ranges and enforce multi-factor authentication for all user accounts to reduce the risk of credential theft preceding exploitation. Additionally, deploying a Web Application Firewall with rules designed to detect abnormal API traversal patterns or excessive resource requests can provide an additional layer of defense against automated exploitation attempts. Regular security audits focusing on authorization logic and input validation are recommended to ensure that future updates maintain rigorous access control standards across all application modules.