XSS Vulnerability in Dify Open-Source LLM App Development Platform
CVE-2026-42138

6.9MEDIUM

Key Information:

Vendor

Langgenius

Status
Dify
Vendor
CVE Published:
4 May 2026

What is CVE-2026-42138?

The Dify platform, a popular open-source LLM application development tool, is susceptible to a Cross-Site Scripting (XSS) vulnerability found in the file upload functionality. Any unauthenticated user has the ability to upload malicious SVG files via the POST /api/files/upload endpoint. Additionally, another endpoint, POST /v1/files/upload, which does require authentication, also displays the same vulnerability. This poses significant security risks as it could lead to unauthorized access and data compromise. The issue has been mitigated in the latest version, 1.13.1, where appropriate patches have been applied to enhance the platform's security.

Affected Version(s)

dify < 1.13.1

References

https://github.com/langgenius/dify/security/advisories/GH...
x_refsource_CONFIRM
https://github.com/langgenius/dify/releases/tag/1.13.1
x_refsource_MISC

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.