CVE-2025-62320: HTML Injection XSS Vulnerability

CVE-2025-62320 Overview

CVE-2025-62320 is an HTML Injection vulnerability that occurs when a web application fails to properly validate or sanitize user input before rendering it on a webpage. This weakness allows attackers to inject arbitrary HTML code into the page content. When a victim's browser loads the compromised page, it may automatically interact with external resources embedded in the injected HTML, leading to unexpected outbound requests from the user's browser.

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The attack requires user interaction but can be executed remotely over the network, making it a concern for public-facing web applications.

Critical Impact

Attackers can inject malicious HTML content that forces victim browsers to make unintended requests to external resources, potentially leading to sensitive data exposure or phishing attacks.

Affected Products

• HCL Software Product (specific product details not disclosed in advisory)

Discovery Timeline

• 2026-03-17 - CVE-2025-62320 published to NVD
• 2026-03-17 - Last updated in NVD database

Technical Details for CVE-2025-62320

Vulnerability Analysis

This HTML Injection vulnerability stems from a failure to implement proper input validation controls within the affected web application. When user-supplied data is reflected back to the browser without adequate sanitization, attackers can craft malicious payloads containing HTML markup that the browser interprets and renders as legitimate page content.

The vulnerability has a changed scope impact, meaning successful exploitation can affect resources beyond the vulnerable component's security context. While the confidentiality impact is limited, the ability to inject HTML enables various attack scenarios including phishing overlays, content spoofing, and forced browser interactions with attacker-controlled resources.

Unlike traditional XSS attacks that execute JavaScript, pure HTML injection attacks focus on manipulating page structure and content. However, depending on the application's Content Security Policy and other security controls, HTML injection can serve as a stepping stone for more sophisticated attacks.

Root Cause

The root cause of CVE-2025-62320 lies in inadequate input sanitization routines within the web application. The application accepts user input and reflects it back in the HTTP response without properly encoding or escaping HTML special characters such as <, >, ", and &. This allows an attacker to break out of the expected data context and inject arbitrary HTML elements that the browser will parse and render.

Attack Vector

The attack vector for this vulnerability is network-based, requiring an attacker to craft a malicious request containing HTML payload that gets stored or reflected by the vulnerable application. The attack requires user interaction—a victim must visit the page containing the injected content.

An attacker could exploit this vulnerability by submitting input containing HTML elements such as <img>, <iframe>, <link>, or <form> tags that reference external resources or create deceptive content. When a victim views the affected page, their browser would render these injected elements, potentially exposing sensitive information through referrer headers, cookies, or by tricking users into submitting data to attacker-controlled endpoints.

For detailed technical information about this vulnerability, refer to the HCL Software Knowledge Base Article.

Detection Methods for CVE-2025-62320

Indicators of Compromise

• Unusual HTML tags or elements appearing in application data fields or URL parameters
• Unexpected outbound network requests from user browsers to unknown external domains
• User reports of modified page appearance or unexpected content
• Web server logs showing suspicious input patterns containing HTML markup

Detection Strategies

• Implement Web Application Firewall (WAF) rules to detect HTML injection patterns in request parameters
• Deploy Content Security Policy (CSP) violation reporting to identify unauthorized resource loading
• Configure log analysis to identify requests containing encoded or raw HTML special characters
• Use SentinelOne Singularity XDR to monitor endpoint behavior for suspicious browser activity patterns

Monitoring Recommendations

• Enable verbose logging for the affected application to capture all user input submissions
• Monitor network traffic for unexpected connections initiated by user browsers after visiting the application
• Review application logs regularly for patterns indicating injection attempts
• Configure alerting for CSP violations that may indicate successful HTML injection

How to Mitigate CVE-2025-62320

Immediate Actions Required

• Review and apply the latest security patches from HCL Software as described in their knowledge base article
• Implement input validation to reject or sanitize HTML special characters in user input
• Enable output encoding for all user-supplied data rendered in HTML contexts
• Deploy or update Content Security Policy headers to restrict resource loading

Patch Information

HCL Software has published guidance for addressing this vulnerability. Refer to the HCL Software Knowledge Base Article for specific patch information and remediation steps.

Workarounds

• Implement strict input validation using allowlists to reject any input containing HTML special characters where HTML is not expected
• Apply HTML entity encoding to all user-supplied data before rendering in web pages
• Deploy a Web Application Firewall with rules configured to block common HTML injection patterns
• Enable strict Content Security Policy headers to prevent loading of external resources from untrusted domains

# Example Content Security Policy header configuration
# Add to web server or application configuration
Content-Security-Policy: default-src 'self'; img-src 'self'; frame-ancestors 'none'; form-action 'self';