Security Bulletin: Langflow is affected by multiple authentication bypass, path traversal, authorization, and server-side request forgery vulnerabilities

Summary Langflow contains multiple vulnerabilities in its authentication, authorization, and network request controls across several API surfaces. The MCP project authentication function omits the default authtype=none value from the set of modes requiring an API key, causing unauthenticated...

Security Bulletin: Langflow is affected by security vulnerabilities in Model Context Protocol features

Summary Langflow uses Model Context Protocol MCP features to manage external server connections, project access, file resources, and local client integration. Weaknesses in MCP command and configuration validation, authentication and authorization enforcement, file resource handling, and request...

Security Bulletin: Langflow OSS is affected by server-side request forgery in provider validation and API request functionality

Summary Langflow OSS includes outbound network request functionality for provider validation and API request execution. Weaknesses in request destination validation and enforcement could allow authenticated users to induce requests to unintended internal or external network locations, which may...

Security Bulletin: Langflow OSS is affected by arbitrary code execution in custom component validation and trusted code enforcement

Summary Langflow OSS supports custom Python components and validation of component code for component development workflows. Weaknesses in custom component execution paths, validation endpoints, and trusted template enforcement could allow authenticated users to execute arbitrary Python code or...

Security Bulletin: Langflow OSS is affected by arbitrary code execution in component generation, validation, and custom component handling

Summary Langflow OSS supports Agentic Assistant generated components and user-supplied custom Python components for workflow development. Weaknesses in code security scanning, runtime validation, custom component execution paths, and trusted code enforcement could allow authenticated users to...

Langflow AI <= 1.6.9 - CORS Misconfiguration

Langflow AI versions 1.6.9 and earlier are vulnerable to a CORS misconfiguration that allows any origin to make credentialed requests. Combined with SameSite=None cookies, this enables cross-origin token theft and subsequent remote code execution via the /api/v1/validate/code endpoint. id:...

Langflow - Broken Access Control

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.7.0.dev45, multiple critical API endpoints in Langflow are missing authentication controls. The issue allows any unauthenticated user to access sensitive user conversation data, transaction histories...

Langflow <= 1.0.12 - Remote Code Execution

Langflow 0.6.19 contains a remote code execution caused by accepting untrusted Python scripts in the /api/v1/customcomponent endpoint, letting remote attackers execute arbitrary code, exploit requires access to the endpoint and untrusted script input. id: CVE-2024-37014 info: name: Langflow =...

Langflow < 1.3.0 - Remote Code Execution via validate_code() exec()

Langflow contains a remote code execution caused by inclusion of functionality from untrusted control sphere in the execglobals parameter at the validate endpoint, letting remote attackers execute arbitrary code as root, exploit requires no authentication. id: CVE-2026-0770 info: name: Langflow...

Langflow < 1.9.1 - Unauthenticated File Upload

Langflow 1.9.1 contains an unrestricted file upload caused by lack of upload limitations, letting unauthenticated attackers exhaust server space and leak absolute file paths, exploit requires network access. id: CVE-2026-55450 info: name: Langflow 1.9.1 - Unauthenticated File Upload author: xtr0n...

Langflow <= 1.8.4 - Path Traversal to RCE via File Upload

The application contains a path traversal vulnerability caused by unsanitized 'filename' parameter in the 'POST /api/v2/files' multipart form data, letting attackers write files to arbitrary filesystem locations, exploit requires crafted request. id: CVE-2026-5027 info: name: Langflow = 1.8.4 -...

Langflow < 1.7.0 - Path Traversal

Langflow 1.7.1 contains a path traversal caused by insufficient filtering of foldername and filename parameters in downloadprofilepicture endpoint, letting attackers read secretkey across directories, exploit requires crafted request. id: CVE-2026-33497 info: name: Langflow 1.7.0 - Path Traversal...

IBM Langflow - Remote Code Execution

IBM Langflow OSS 1.0.0 through 1.10.0 contains a remote code execution caused by chaining /api/v1/autologin and /api/v1/validate/code endpoints, letting unauthenticated attackers execute arbitrary code remotely, exploit requires no authentication. id: CVE-2026-9198 info: name: IBM Langflow - Remo...

Langflow < 1.9.0 - Remote Code Execution

Langflow versions prior to 1.9.0 are vulnerable to unauthenticated remote code execution RCE via the buildpublictmp endpoint. Attackers can submit a manipulated flow JSON containing Python code that is executed during the build process without proper sandboxing. id: CVE-2026-33017 info: name:...

CVE-2026-19875

IBM Langflow OSS 1.0.0 through 1.10.0 could allow a remote attacker to overwrite administrator email information and abuse the server as an outbound relay due to missing authentication for the registration endpoint...

CVE-2026-19875

IBM Langflow OSS versions 1.0.0 through 1.10.0 contain an authentication bypass in the POST /api/v2/registration/ endpoint (CWE-306). An unauthenticated remote attacker can overwrite the server's registered admin email address and trigger outbound telemetry calls, enabling the instance to be abus...

CVE-2026-19875 Unauthenticated Registration POST Endpoint Permits Admin Email Overwrite and Outbound Relay Abuse in Langflow

IBM Langflow OSS 1.0.0 through 1.10.0 could allow a remote attacker to overwrite administrator email information and abuse the server as an outbound relay due to missing authentication for the registration endpoint...

EUVD-2026-62606

IBM Langflow OSS 1.0.0 through 1.10.0 could allow a remote attacker to overwrite administrator email information and abuse the server as an outbound relay due to missing authentication for the registration endpoint...

Security Bulletin: Unauthenticated Remote Code Execution via Auto-Login Bypass and Code Validation

Summary A vulnerability allowed unauthenticated attackers to achieve remote code execution on default-configured instances. The vulnerability combined two distinct issues: an unauthenticated endpoint that issued superuser bearer tokens to any network caller, and a code validation endpoint that...

Security Bulletin: Unauthenticated Registration POST Endpoint Permits Admin Email Overwrite and Outbound Relay Abuse in Langflow

Summary The POST /api/v2/registration/ endpoint in affected versions lacked authentication requirements, allowing unauthenticated attackers to overwrite the server's registered admin email address and trigger outbound telemetry calls to external servers, enabling the Langflow instance to be abuse...