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CVE-2025-34291

Langflow <= 1.6.9 CORS Misconfiguration to Token Hijack & RCE

Langflow versions up to and including 1.6.9 contain a chained vulnerability that enables account takeover and remote code execution. An overly permissive CORS configuration (allow_origins='*' with allow_credentials=True) combined with a refresh token cookie configured as SameSite=None allows a malicious webpage to perform cross-origin requests that include credentials and successfully call the refresh endpoint. An attacker-controlled origin can therefore obtain fresh access_token / refresh_token pairs for a victim session. Obtained tokens permit access to authenticated endpoints — including built-in code-execution functionality — allowing the attacker to execute arbitrary code and achieve full system compromise.

CVSS 4.0 · 9.4 Critical EPSS 93.2% KEV · Listed
Vendors
Langflow
Products
Langflow
CVE-2026-42048

Langflow: Path Traversal in Langflow Knowledge Bases API

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to 1.9.0, Langflow is vulnerable to Path Traversal in the Knowledge Bases API (DELETE /api/v1/knowledge_bases). This occurs because user-supplied knowledge base names are concatenated directly into file paths without proper sanitization or boundary validation. An authenticated attacker can exploit this flaw to delete arbitrary directories anywhere on the server's filesystem, leading to data loss and potential service disruption. This vulnerability is fixed in 1.9.0.

CVSS 3.1 · 9.6 Critical EPSS 4.2% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-4503

Unauthenticated Insecure Direct Object Reference (IDOR) Vulnerability in Langflow Desktop Image Download Endpoint

IBM Langflow Desktop 1.0.0 through 1.8.4 Langflow could allow an unauthenticated user to view other users' images due to an indirect object reference through a user-controlled key.

CVSS 3.1 · 7.5 High EPSS < 1% KEV · Not listed
Vendors
Ibm Langflow
Products
Langflow Desktop Langflow Desktop
CVE-2026-4502

Arbitrary File Write and Remote Code Execution Vulnerability in Langflow v2 API

IBM Langflow Desktop 1.2.0 through 1.8.4 Langflow could allow an authenticated attacker to traverse directories on the system. An attacker could send a specially crafted URL request containing "dot dot" sequences (/../) to write arbitrary files on the system.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Ibm Langflow
Products
Langflow Desktop Langflow Desktop
CVE-2026-3346

Stored Cross-Site Scripting (XSS) in Langflow Markdown Rendering via rehypeRaw

IBM Langflow Desktop 1.6.0 through 1.8.4 Lanflow is vulnerable to stored cross-site scripting. This vulnerability allows an authenticated user to embed arbitrary JavaScript code in the Web UI thus altering the intended functionality potentially leading to credentials disclosure within a trusted session.

CVSS 3.1 · 6.4 Medium EPSS < 1% KEV · Not listed
Vendors
Ibm Langflow
Products
Langflow Desktop Langflow Desktop
CVE-2026-3340

Server-Side Request Forgery (SSRF) in Langflow URL Component

IBM Langflow Desktop 1.0.0 through 1.8.4 IBM Langflow is vulnerable to server-side request forgery (SSRF). This may allow an authenticated attacker to send unauthorized requests from the system, potentially leading to network enumeration or facilitating other attacks.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Ibm Langflow
Products
Langflow Desktop Langflow Desktop
CVE-2026-3345

Path Traversal and Arbitrary File Write Vulnerability in IBM Langflow Desktop API v2 File Upload Endpoint

IBM Langflow Desktop <=1.8.4 Langflow could allow a remote attacker to traverse directories on the system. An attacker could send a specially crafted URL request containing "dot dot" sequences (/../) to view arbitrary files on the system.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Ibm Langflow
Products
Langflow Desktop Langflow Desktop
CVE-2026-6543

Authenticated Remote Code Execution Vulnerability in Langflow Code Validation Endpoint

IBM Langflow Desktop 1.0.0 through 1.8.4 Langflow allows an attacker to execute arbitrary commands with the privileges of the process running Langflow. This allows reading sensitive environment variables (API keys, DB credentials), modifying files, or launching further attacks on the internal network.

CVSS 3.1 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Ibm Langflow
Products
Langflow Desktop Langflow Desktop
CVE-2026-7687

langflow-ai langflow Full Builtins code_parser.py CodeParser.parse_callable_details command injection

A vulnerability was determined in langflow-ai langflow up to 1.8.4. Affected by this issue is the function CodeParser.parse_callable_details of the file src/lfx/src/lfx/custom/code_parser/code_parser.py of the component Full Builtins Module Handler. Executing a manipulation can lead to command injection. The attack can be executed remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS 4.0 · 5.3 Medium EPSS 3.0% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-6542

Monitor API allows cross-user read of transaction logs and deletion of build data via flow_id

IBM Langflow OSS 1.0.0 through 1.8.4 could allow any user to supply a flow_id to read transaction logs and vertex build data belonging to other users, and to delete persisted vertex build data for another user's flow.

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Ibm Langflow
Products
Langflow Oss Langflow
CVE-2026-6597

langflow-ai langflow Flow Using API core.py has_api_terms credentials storage

A weakness has been identified in langflow-ai langflow up to 1.8.3. Impacted is the function remove_api_keys/has_api_terms of the file src/backend/base/langflow/api/utils/core.py of the component Flow Using API. This manipulation causes unprotected storage of credentials. The attack can be initiated remotely. The exploit has been made available to the public and could be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-6596

langflow-ai langflow API Endpoint endpoints.py create_upload_file unrestricted upload

A security flaw has been discovered in langflow-ai langflow up to 1.1.0. This issue affects the function create_upload_file of the file src/backend/base/Langflow/api/v1/endpoints.py of the component API Endpoint. The manipulation results in unrestricted upload. It is possible to launch the attack remotely. The exploit has been released to the public and may be used for attacks. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS 4.0 · 6.9 Medium EPSS < 1% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-6600

langflow-ai langflow Frontend React Component Rendering edit-message.tsx cross site scripting

A flaw has been found in langflow-ai langflow up to 1.8.3. This affects an unknown function of the file src/frontend/src/modals/IOModal/components/chatView/chatMessage/components/edit-message.tsx of the component Frontend React Component Rendering. Executing a manipulation can lead to cross site scripting. The attack may be launched remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS 4.0 · 5.1 Medium EPSS < 1% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-6599

langflow-ai langflow Model Context Protocol Configuration API mcp_projects.py install_mcp_config injection

A vulnerability was detected in langflow-ai langflow up to 1.8.3. The impacted element is the function get_client_ip/install_mcp_config of the file src/backend/base/langflow/api/v1/mcp_projects.py of the component Model Context Protocol Configuration API. Performing a manipulation of the argument X-Forwarded-For results in injection. The attack may be initiated remotely. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-6598

langflow-ai langflow Project Creation Endpoint projects.py encrypt_auth_settings cleartext storage in file

A security vulnerability has been detected in langflow-ai langflow up to 1.8.3. The affected element is the function create_project/encrypt_auth_settings of the file src/backend/base/Langflow/api/v1/projects.py of the component Project Creation Endpoint. Such manipulation of the argument auth_settings leads to cleartext storage in a file or on disk. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

CVSS 4.0 · 5.3 Medium EPSS < 1% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-5026

Langflow - Stored XSS via Malicious SVG Upload

The '/api/v1/files/images/{flow_id}/{file_name}' endpoint serves SVG files with the 'image/svg+xml' content type without sanitizing their content. Since SVG files can contain embedded JavaScript, an attacker can upload a malicious SVG that executes arbitrary JavaScript when viewed by other users, leading to stored cross-site scripting (XSS). This allows stealing authentication tokens stored in cookies, including JWT access and refresh tokens.

CVSS 4.0 · 7 High EPSS < 1% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-5025

Langflow - Application Logs Exposed to All Authenticated Users

The '/logs' and '/logs-stream' endpoints in the log router allow any authenticated user to read the full application log buffer. These endpoints only require basic authentication ('get_current_active_user') without any privilege checks (e.g., 'is_superuser').

CVSS 3.1 · 6.5 Medium EPSS < 1% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-5022

Langflow - Missing Authorization on download_image Endpoint

The '/api/v1/files/images/{flow_id}/{file_name}' endpoint does not enforce any authentication or authorization checks, allowing any unauthenticated user to download images belonging to any flow by knowing (or guessing) the flow ID and file name.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-0772

Langflow Disk Cache Deserialization of Untrusted Data Remote Code Execution Vulnerability

Langflow Disk Cache Deserialization of Untrusted Data Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Langflow. Authentication is required to exploit this vulnerability. The specific flaw exists within the disk cache service. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to execute code in the context of the service account. Was ZDI-CAN-27919.

CVSS 3.0 · 7.5 High EPSS 1.2% KEV · Not listed
Vendors
Langflow
Products
Langflow
CVE-2026-27966

Langflow has Remote Code Execution in CSV Agent

Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.8.0, the CSV Agent node in Langflow hardcodes `allow_dangerous_code=True`, which automatically exposes LangChain’s Python REPL tool (`python_repl_ast`). As a result, an attacker can execute arbitrary Python and OS commands on the server via prompt injection, leading to full Remote Code Execution (RCE). Version 1.8.0 fixes the issue.

CVSS 3.1 · 9.8 Critical EPSS 35.2% KEV · Not listed
Vendors
Langflow
Products
Langflow