CVE-2026-10700: Broken Access Control Vulnerabilities in Langflow 1.0.0 - 1.8.4 File Handling API Allowed Unauthorized Access to User Files
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/{flowid}/{filename} endpoint does not enforce authentication or authorization checks, allowing unauthenticated remote attackers to retrieve image files associated with any flow by specifying a valid flowid and filename.Additionally, the /api/v1/files/download/{flowid}/{filename} 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.
Other sources
Langflow OSS contains multiple broken access control vulnerabilities in its file handling API that allow unauthorized access to user files.The /api/v1/files/images/{flowid}/{filename} endpoint does not enforce authentication or authorization checks, allowing unauthenticated remote attackers to retrieve image files associated with any flow by specifying a valid flowid and filename.Additionally, the /api/v1/files/download/{flowid}/{filename} 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.
— IBM
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Langflow OSSto a version that resolves this vulnerability.Fixed in 1.9.0
Event History
Frequently Asked Questions
Who is exposed to unauthenticated file access?
Deployments running affected Langflow OSS versions are exposed through the image-file endpoint if an attacker can supply a valid flow_id and file_name. No authentication is required for that endpoint.
What access does an attacker need to retrieve files from other users through the download endpoint?
The download endpoint requires the attacker to be authenticated. However, the endpoint does not properly validate ownership, so an authenticated user can request files belonging to other users using arbitrary flow and file identifiers.
What data may be exposed?
Image files associated with flows may be retrieved through the unauthenticated endpoint, and files stored in private flows may be disclosed through the authorization bypass. In multi-user deployments, the issue breaks tenant isolation.