CVE-2026-10700

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Unauthenticated File Access in IBM Langflow OSS

Publication date: 2026-07-30

Last updated on: 2026-07-30

Assigner: IBM Corporation

Description

IBM Langflow OSS 1.0.0 through 1.8.4 contains multiple broken access control vulnerabilities in its file handling API that allow unauthorized access to user files.The /api/v1/files/images/{flow_id}/{file_name} endpoint does not enforce authentication or authorization checks, allowing unauthenticated remote attackers to retrieve image files associated with any flow by specifying a valid flow_id and file_name.Additionally, the /api/v1/files/download/{flow_id}/{file_name} endpoint requires authentication but fails to properly validate ownership of the requested resource. As a result, an authenticated user can access files belonging to other users by supplying arbitrary identifiers, leading to an authorization bypass (IDOR).Successful exploitation may result in unauthorized disclosure of sensitive data, including files stored in private flows. This issue breaks tenant isolation in multi-user deployments.

CVSS Scores

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Meta Information

Published

2026-07-30

Last Modified

2026-07-30

Generated

2026-07-31

AI Q&A

2026-07-31

EPSS Evaluated

N/A

NVD

CVE-2026-10700

EUVD

EUVD-2026-51247

Affected Vendors & Products

Vendor	Product	Version / Range
ibm	langflow	From 1.0.0 (inc) to 1.8.4 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-639	The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

Attack-Flow Graph

Executive Summary

IBM Langflow OSS 1.0.0 through 1.8.4 has broken access control flaws in its file handling API. Two endpoints are affected: one allows unauthenticated attackers to retrieve image files from any flow by specifying a valid flow_id and file_name, while the other lets authenticated users access files belonging to other users by supplying arbitrary identifiers, bypassing ownership checks.

Detection Guidance

To detect this vulnerability, check if your IBM Langflow OSS instance (versions 1.0.0 through 1.8.4) exposes the vulnerable endpoints /api/v1/files/images/{flow_id}/{file_name} or /api/v1/files/download/{flow_id}/{file_name}. Test unauthenticated access to these endpoints by attempting to retrieve files using known flow IDs and file names.

Impact Analysis

This vulnerability could allow unauthorized access to sensitive files, including those in private flows. Attackers might steal confidential data, violate user privacy, or bypass tenant isolation in multi-user environments. The impact depends on the sensitivity of the exposed files.

Compliance Impact

This vulnerability likely violates compliance requirements such as GDPR (data protection) and HIPAA (health information privacy) due to unauthorized data exposure. It breaks tenant isolation, potentially leading to legal penalties, loss of trust, and regulatory fines for failing to protect sensitive user data.

Mitigation Strategies

Immediately upgrade IBM Langflow OSS to a version beyond 1.8.4 where these vulnerabilities are patched. If upgrading is not immediately possible, restrict network access to the vulnerable endpoints using firewalls or network segmentation. Ensure strict authentication and authorization checks are enforced for all file access endpoints.

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