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CVE-2026-5026— Langflow - Stored XSS via Malicious SVG Upload

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存在安全漏洞，该漏洞源于端点/api/v1/files/images/{flow_id}/{file_name}在提供SVG文件时未清理内容，可能导致存储型跨站脚本，攻击者可上传恶意SVG文件在其他用户查看时执行任意JavaScript，窃取身份验证令牌。

AI Predicted 8.2 Difficulty: Easy EPSS 0.27% · P17
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I. Basic Information for CVE-2026-5026

Vulnerability Information
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Vulnerability Title
Langflow - Stored XSS via Malicious SVG Upload
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:L/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
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存在安全漏洞，该漏洞源于端点/api/v1/files/images/{flow_id}/{file_name}在提供SVG文件时未清理内容，可能导致存储型跨站脚本，攻击者可上传恶意SVG文件在其他用户查看时执行任意JavaScript，窃取身份验证令牌。
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 0 -

II. Public POCs for CVE-2026-5026

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III. Intelligence Information for CVE-2026-5026

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Vendor Advisories for CVE-2026-5026 (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-2026-34046 Langflow: Authenticated Users Can Read, Modify, and Delete Any Flow via Missing Ownership
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-79

V. Comments for CVE-2026-5026

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