Cross-Site Scripting Vulnerability in langgenius Dify Web Application
CVE-2026-85021

5.3MEDIUM

Key Information:

Vendor

Langgenius

Status
Dify
Vendor
CVE Published:
3 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-85021?

A vulnerability exists in langgenius Dify 1.13.0 due to improper handling of the redirect_url parameter in the router.replace function within the splash.tsx file of the Splash Layout component. This flaw allows attackers to execute arbitrary JavaScript in the context of the user's session, leading to potential unauthorized actions and data leakage. The attack can be conducted remotely, posing a significant risk to users. Despite the public disclosure of this exploit, the vendor did not provide a response when informed.

Affected Version(s)

dify 1.13.0

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-85021 - Proof of Concept

References

https://vuldb.com/vuln/398288
vdb-entrytechnical-description
https://vuldb.com/vuln/398288/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-85021
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
Unknown

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

trebledj (VulDB User)
VulDB CNA Team
.