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CVE-2026-34046— Langflow: Authenticated Users Can Read, Modify, and Delete Any Flow via Missing Ownership Check

Quick assessment

Affected
langflow-ai langflow
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Langflow是Langflow开源的一个用于构建多代理和 RAG 应用程序的可视化框架。 Langflow 1.5.1之前版本存在安全漏洞，该漏洞源于_read_flow助手缺少所有权检查，可能导致经过身份验证的用户读取、修改或删除其他用户的流程。

AI Predicted 8.1 Difficulty: Easy EPSS 0.68% · P51
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I. Basic Information for CVE-2026-34046

Vulnerability Information
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Vulnerability Title
Langflow: Authenticated Users Can Read, Modify, and Delete Any Flow via Missing Ownership Check
Source: CVE Program / CVE List V5
Vulnerability Description
Langflow is a tool for building and deploying AI-powered agents and workflows. Prior to version 1.5.1, the `_read_flow` helper in `src/backend/base/langflow/api/v1/flows.py` branched on the `AUTO_LOGIN` setting to decide whether to filter by `user_id`. When `AUTO_LOGIN` was `False` (i.e., authentication was enabled), neither branch enforced an ownership check — the query returned any flow matching the given UUID regardless of who owned it. This allowed any authenticated user to read any other user's flow, including embedded plaintext API keys; modify the logic of another user's AI agents, and/or delete flows belonging to other users. The vulnerability was introduced by the conditional logic that was meant to accommodate public/example flows (those with `user_id = NULL`) under auto-login mode, but inadvertently left the authenticated path without an ownership filter. The fix in version 1.5.1 removes the `AUTO_LOGIN` conditional entirely and unconditionally scopes the query to the requesting user.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Langflow 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Langflow是Langflow开源的一个用于构建多代理和 RAG 应用程序的可视化框架。 Langflow 1.5.1之前版本存在安全漏洞，该漏洞源于_read_flow助手缺少所有权检查，可能导致经过身份验证的用户读取、修改或删除其他用户的流程。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
langflow-ai langflow < 1.5.1 -
langflow-ai langflow-base < 0.5.1 -

II. Public POCs for CVE-2026-34046

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III. Intelligence Information for CVE-2026-34046

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Patches & Fixes for CVE-2026-34046 (1)

Vendor Advisories for CVE-2026-34046 (1)

Same Patch Batch · langflow-ai · 2026-03-27 · 6 CVEs total

CVE-2026-5027 8.8 HIGH Langflow - Path Traversal Arbitrary File Write via upload_user_file
CVE-2026-5025 6.5 MEDIUM Langflow - Application Logs Exposed to All Authenticated Users
CVE-2026-5022 Langflow - Missing Authorization on download_image Endpoint
CVE-2026-5026 Langflow - Stored XSS via Malicious SVG Upload
CVE-2026-33873 Langflow has Authenticated Code Execution in Agentic Assistant Validation

IV. Related Vulnerabilities

Same product: langflow
Same vendor: langflow-ai
Same weakness: CWE-639

V. Comments for CVE-2026-34046

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