CVE-2026-42138— Dify Vulnerable to Stored XSS via SVG-file upload
Quick assessment
Affected
langgenius dify
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.
dify是LangGenius开源的一个开源的 LLM 应用程序开发平台。 Dify 1.13.1之前版本存在跨站脚本漏洞，该漏洞源于POST /api/files/upload方法允许未认证用户上传包含跨站脚本的SVG文件，POST /v1/files/upload方法也存在此漏洞。
Possible ATT&CK Techniques 3 AI
T1059 · Command and Scripting Interpreter T1195 · Supply Chain Compromise T1189 · Drive-by CompromiseAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| langgenius | dify | < 1.13.1 |
affected |
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I. Basic Information for CVE-2026-42138
Vulnerability Information
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Vulnerability Title
Dify Vulnerable to Stored XSS via SVG-file upload
Source: CVE Program / CVE List V5
Vulnerability Description
Dify is an open-source LLM app development platform. Prior to version 1.13.1, using the method POST /api/files/upload, any unauthenticated user can upload an SVG file with XSS. The method POST /v1/files/upload, which requires authentication through the application API, is also vulnerable. This issue has been patched in version 1.13.1.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/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
dify 跨站脚本漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
dify是LangGenius开源的一个开源的 LLM 应用程序开发平台。 Dify 1.13.1之前版本存在跨站脚本漏洞，该漏洞源于POST /api/files/upload方法允许未认证用户上传包含跨站脚本的SVG文件，POST /v1/files/upload方法也存在此漏洞。
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 |
|---|---|---|---|---|
| langgenius | dify | < 1.13.1 | - |
|
II. Public POCs for CVE-2026-42138
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2026-42138 (1)
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V. Comments for CVE-2026-42138
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