CVE-2025-55273: Hcltech Aftermarket Cloud XSS Vulnerability

CVE-2025-55273 Overview

HCL Aftermarket DPC is affected by a Cross Domain Script Include (XDSI) vulnerability that allows attackers to leverage external scripts to tamper with the Document Object Model (DOM). This vulnerability enables malicious actors to alter the content or behavior of the application, potentially leading to significant security compromises. Attackers can exploit this weakness to steal cookies or session tokens, facilitating session hijacking attacks against legitimate users.

Critical Impact
Attackers can inject external scripts to manipulate the DOM, steal session tokens and cookies, and hijack user sessions, potentially compromising user accounts and sensitive data.

Affected Products

HCL Aftermarket Cloud version 1.0.0
HCLTech Aftermarket Cloud

Discovery Timeline

2026-03-26 - CVE CVE-2025-55273 published to NVD
2026-03-26 - Last updated in NVD database

Technical Details for CVE-2025-55273

Vulnerability Analysis

This vulnerability falls under CWE-829 (Inclusion of Functionality from Untrusted Control Sphere), which occurs when the application includes executable functionality from a source outside of its trust boundary without proper validation. In the case of HCL Aftermarket DPC, the application fails to properly validate or restrict external script inclusions, allowing attackers to inject malicious JavaScript from untrusted domains.

The attack requires user interaction, as victims must be lured to a malicious page or the attacker must find a way to inject the external script reference into the application context. Once executed, the malicious script operates within the security context of the vulnerable application, giving it access to DOM elements, cookies, and session storage.

Root Cause

The root cause of this vulnerability is the improper handling of cross-domain script includes within the HCL Aftermarket DPC application. The application does not implement adequate Content Security Policy (CSP) restrictions or script source validation, allowing external JavaScript files to be loaded and executed within the application's context. This design flaw violates the principle of least privilege by granting untrusted external code the same permissions as legitimate application scripts.

Attack Vector

The attack is network-based, requiring an attacker to either compromise a third-party script source referenced by the application or inject a reference to a malicious script. The attack flow typically involves:

Identifying script include mechanisms within the application that accept external URLs
Crafting a malicious JavaScript payload designed to extract sensitive information or manipulate the DOM
Hosting the malicious script on an attacker-controlled domain
Inducing the victim to load the compromised page or triggering the script inclusion through application functionality

Once the malicious script executes, it can access document.cookie to exfiltrate session tokens, modify form actions to capture credentials, or alter application behavior to deceive users. The vulnerability does not require authentication to exploit, though successful exploitation depends on user interaction.

Detection Methods for CVE-2025-55273

Indicators of Compromise

Unexpected external script requests to domains not associated with HCL or authorized third-party services
Unusual DOM modifications or injected iframe elements within HCL Aftermarket DPC pages
Session token or cookie exfiltration attempts visible in network traffic logs
Client-side JavaScript errors indicating script injection attempts

Detection Strategies

Implement Content Security Policy (CSP) monitoring to detect policy violations and unauthorized script sources
Deploy web application firewall (WAF) rules to identify and block requests containing suspicious script include patterns
Monitor browser console logs and client-side error reports for script injection indicators
Review application logs for unusual patterns of external resource loading

Monitoring Recommendations

Enable detailed logging of all external resource requests made by the application
Configure alerts for CSP violation reports to identify potential exploitation attempts
Monitor user session anomalies that may indicate session hijacking following script execution
Implement real-time monitoring of outbound traffic for potential data exfiltration to unknown domains

How to Mitigate CVE-2025-55273

Immediate Actions Required

Review and restrict all external script includes within the HCL Aftermarket DPC deployment
Implement a strict Content Security Policy (CSP) that limits script sources to trusted domains only
Enable HttpOnly and Secure flags on all session cookies to reduce the impact of potential cookie theft
Apply vendor-provided patches as soon as they become available from HCL

Patch Information

HCL has published a knowledge base article addressing this vulnerability. Administrators should consult the HCL Software Knowledge Base Article for specific patch instructions and updated software versions. Contact HCL Support for access to security updates and detailed remediation guidance specific to your deployment configuration.

Workarounds

Implement a strict Content Security Policy header that explicitly whitelists allowed script sources using script-src directives
Use Subresource Integrity (SRI) hashes for all external scripts to ensure only verified code executes
Consider placing the application behind a reverse proxy with script filtering capabilities
Disable or remove any unnecessary external script dependencies until patches are applied

bash

# Example CSP header configuration for web server
# Add to your web server configuration or application headers
Content-Security-Policy: default-src 'self'; script-src 'self' https://trusted-cdn.hcltechsw.com; object-src 'none'; base-uri 'self';