CVE-2025-9096: Cross Site Scripting in ExpressGateway express-gateway
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.
AI Analysis
Technical Summary
CVE-2025-9096 is a cross-site scripting (XSS) vulnerability identified in the ExpressGateway project, specifically affecting the express-gateway component versions 1.16.0 through 1.16.10. The vulnerability resides in an unspecified function within the REST endpoint implementation, located in the lib/rest/routes/apps.js file. This flaw allows an attacker to inject malicious scripts that can be executed in the context of a victim's browser when interacting with the vulnerable REST endpoint. The attack can be launched remotely without requiring authentication, although user interaction is necessary to trigger the malicious payload (e.g., by visiting a crafted URL or interacting with a compromised interface). The vulnerability has been publicly disclosed, and while no known exploits are currently observed in the wild, the disclosure increases the risk of exploitation attempts. The vendor has not responded to the disclosure, and no official patches or mitigations have been released at the time of publication. The CVSS v4.0 base score is 5.1, reflecting a medium severity level, with the attack vector being network-based, low attack complexity, no privileges required, but requiring user interaction. The impact primarily affects confidentiality and integrity at a limited level, as the XSS could be used to steal session tokens, perform actions on behalf of users, or deliver further payloads. The vulnerability does not affect availability or system-level integrity directly. Given the nature of ExpressGateway as an API gateway solution often deployed in microservices and cloud environments, exploitation could lead to compromise of user sessions or unauthorized actions within applications relying on the gateway for API management and security enforcement.
Potential Impact
For European organizations, the impact of CVE-2025-9096 could be significant, especially for those relying on ExpressGateway as a critical component in their API infrastructure. Successful exploitation could lead to session hijacking, unauthorized access to sensitive data, or manipulation of API requests, potentially exposing personal data protected under GDPR. This could result in regulatory penalties, reputational damage, and operational disruptions. Organizations in sectors such as finance, healthcare, and government, which often use API gateways to secure sensitive services, may face elevated risks. Additionally, the lack of vendor response and absence of patches increases the window of exposure, potentially encouraging attackers to develop exploits. The requirement for user interaction means phishing or social engineering could be used to trigger the attack, increasing the risk in environments with less security awareness. Furthermore, the vulnerability could be chained with other attacks to escalate privileges or move laterally within networks, amplifying its impact.
Mitigation Recommendations
Given the absence of official patches, European organizations should implement immediate compensating controls. These include: 1) Deploying Web Application Firewalls (WAFs) with custom rules to detect and block typical XSS payloads targeting the vulnerable REST endpoints. 2) Conducting thorough input validation and output encoding on all user-supplied data before it reaches the ExpressGateway, possibly by adding reverse proxies or API gateways with stricter sanitization. 3) Restricting access to the vulnerable REST endpoints to trusted networks or authenticated users where possible, reducing exposure. 4) Enhancing user awareness training to mitigate the risk of social engineering attacks that could trigger the XSS. 5) Monitoring logs and network traffic for unusual requests or patterns indicative of exploitation attempts. 6) Planning and testing upgrades to newer versions of ExpressGateway once patches become available or considering alternative API gateway solutions with active security support. 7) Implementing Content Security Policy (CSP) headers to limit the impact of potential XSS payloads in browsers. These targeted measures go beyond generic advice by focusing on immediate risk reduction and preparing for eventual patch deployment.
Affected Countries
Germany, France, United Kingdom, Netherlands, Sweden, Italy, Spain
CVE-2025-9096: Cross Site Scripting in ExpressGateway express-gateway
Description
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.
AI-Powered Analysis
Technical Analysis
CVE-2025-9096 is a cross-site scripting (XSS) vulnerability identified in the ExpressGateway project, specifically affecting the express-gateway component versions 1.16.0 through 1.16.10. The vulnerability resides in an unspecified function within the REST endpoint implementation, located in the lib/rest/routes/apps.js file. This flaw allows an attacker to inject malicious scripts that can be executed in the context of a victim's browser when interacting with the vulnerable REST endpoint. The attack can be launched remotely without requiring authentication, although user interaction is necessary to trigger the malicious payload (e.g., by visiting a crafted URL or interacting with a compromised interface). The vulnerability has been publicly disclosed, and while no known exploits are currently observed in the wild, the disclosure increases the risk of exploitation attempts. The vendor has not responded to the disclosure, and no official patches or mitigations have been released at the time of publication. The CVSS v4.0 base score is 5.1, reflecting a medium severity level, with the attack vector being network-based, low attack complexity, no privileges required, but requiring user interaction. The impact primarily affects confidentiality and integrity at a limited level, as the XSS could be used to steal session tokens, perform actions on behalf of users, or deliver further payloads. The vulnerability does not affect availability or system-level integrity directly. Given the nature of ExpressGateway as an API gateway solution often deployed in microservices and cloud environments, exploitation could lead to compromise of user sessions or unauthorized actions within applications relying on the gateway for API management and security enforcement.
Potential Impact
For European organizations, the impact of CVE-2025-9096 could be significant, especially for those relying on ExpressGateway as a critical component in their API infrastructure. Successful exploitation could lead to session hijacking, unauthorized access to sensitive data, or manipulation of API requests, potentially exposing personal data protected under GDPR. This could result in regulatory penalties, reputational damage, and operational disruptions. Organizations in sectors such as finance, healthcare, and government, which often use API gateways to secure sensitive services, may face elevated risks. Additionally, the lack of vendor response and absence of patches increases the window of exposure, potentially encouraging attackers to develop exploits. The requirement for user interaction means phishing or social engineering could be used to trigger the attack, increasing the risk in environments with less security awareness. Furthermore, the vulnerability could be chained with other attacks to escalate privileges or move laterally within networks, amplifying its impact.
Mitigation Recommendations
Given the absence of official patches, European organizations should implement immediate compensating controls. These include: 1) Deploying Web Application Firewalls (WAFs) with custom rules to detect and block typical XSS payloads targeting the vulnerable REST endpoints. 2) Conducting thorough input validation and output encoding on all user-supplied data before it reaches the ExpressGateway, possibly by adding reverse proxies or API gateways with stricter sanitization. 3) Restricting access to the vulnerable REST endpoints to trusted networks or authenticated users where possible, reducing exposure. 4) Enhancing user awareness training to mitigate the risk of social engineering attacks that could trigger the XSS. 5) Monitoring logs and network traffic for unusual requests or patterns indicative of exploitation attempts. 6) Planning and testing upgrades to newer versions of ExpressGateway once patches become available or considering alternative API gateway solutions with active security support. 7) Implementing Content Security Policy (CSP) headers to limit the impact of potential XSS payloads in browsers. These targeted measures go beyond generic advice by focusing on immediate risk reduction and preparing for eventual patch deployment.
Affected Countries
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Technical Details
- Data Version
- 5.1
- Assigner Short Name
- VulDB
- Date Reserved
- 2025-08-17T12:53:58.111Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 68a26a1cad5a09ad009d25c7
Added to database: 8/17/2025, 11:47:40 PM
Last enriched: 8/18/2025, 12:02:48 AM
Last updated: 8/18/2025, 4:52:25 AM
Views: 4
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