3.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-9096

CVE-2025-9096: ExpressGateway Cross-Site Scripting Vulnerability in lib/rest/routes/apps.js

A vulnerability has been found in ExpressGateway express-gateway up to 1.16.10. Affected is an unknown function in the library lib/rest/routes/apps.js of the component REST Endpoint. The manipulation leads to cross site scripting. It is possible to launch the attack remotely. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

(GitHub Advisory)

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CVE-2025-9096

CVE-2025-9096:

3.5

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
express-gateway	npm	<= 1.16.10

Technical Details

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Root Cause Analysis

The analysis of the vulnerability is based on the detailed information provided in the GitHub issue referenced in the advisory. The issue explicitly points out a reflected Cross-Site Scripting (XSS) vulnerability in the Express Gateway's REST API endpoints, specifically /apps/:id and /users/:id. The root cause is the lack of output encoding for user-supplied input from the URL parameters. The provided code snippet from lib/rest/routes/apps.js clearly shows that req.params.id is directly embedded in the response when an application is not found. This allows an attacker to craft a URL with a malicious script in the id parameter, which gets executed by the victim's browser. The issue report also confirms that the /users/:id endpoint suffers from the same type of vulnerability, and it is reasonable to conclude that a similar insecure coding practice exists in lib/rest/routes/users.js. The vulnerable functions are the anonymous callback functions used as route handlers in the Express framework, which are identified here by the route they serve.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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