CVE-2025-58747: dify XSS — Exploit & Fix

Description

Dify is an LLM application development platform. In Dify versions through 1.9.1, the MCP OAuth component is vulnerable to cross-site scripting when a victim connects to an attacker-controlled remote MCP server. The vulnerability exists in the OAuth flow implementation where the authorization_url provided by a remote MCP server is directly passed to window.open without validation or sanitization. An attacker can craft a malicious MCP server that returns a JavaScript URI (such as javascript:alert(1)) in the authorization_url field, which is then executed when the victim attempts to connect to the MCP server. This allows the attacker to execute arbitrary JavaScript in the context of the Dify application.

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CVSS v3.1 Score

6.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Weakness Type (CWE)

CWE-79 Cross-site Scripting (XSS)

Affected Products

Vendor	Product	Versions
langgenius	dify	< 1.9.2

References

Advisories & Patches

https://github.com/langgenius/dify/commit/bfda4ce7e6f39d43a4420e97e23a18edcfe3e3d3 https://github.com/langgenius/dify/security/advisories/GHSA-9jch-j9qf-vqfw

Exploits

https://github.com/langgenius/dify/security/advisories/GHSA-9jch-j9qf-vqfw

Frequently Asked Questions

What is CVE-2025-58747? +

Dify is an LLM application development platform. In Dify versions through 1.9.1, the MCP OAuth component is vulnerable to cross-site scripting when a victim connects to an attacker-controlled remote MCP server. The vulnerability exists in the OAuth flow implementation where the authorization_url provided by a remote MCP server is directly passed to window.open without validation or sanitization. An attacker can craft a malicious MCP server that returns a JavaScript URI (such as javascript:alert(1)) in the authorization_url field, which is then executed when the victim attempts to connect to the MCP server. This allows the attacker to execute arbitrary JavaScript in the context of the Dify application. It has a CVSS v3.1 base score of 6.1 (MEDIUM).

How severe is CVE-2025-58747? +

CVE-2025-58747 has a CVSS v3.1 score of 6.1 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-58747? +

CVE-2025-58747 affects products from langgenius, specifically: dify. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-58747? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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