CVE-2025-41011: PHP Point of Sale XSS Vulnerability

CVE-2025-41011 Overview

An HTML injection vulnerability has been identified in PHP Point of Sale v19.4. This security flaw allows attackers to inject and render arbitrary HTML content in a victim's browser due to insufficient validation of user-supplied input. The vulnerability is triggered through requests to the /reports/generate/specific_customer endpoint, specifically exploiting the start_date_formatted and end_date_formatted parameters.

Critical Impact

Attackers can inject malicious HTML content that renders in victims' browsers, potentially leading to phishing attacks, session hijacking through social engineering, or defacement of the application interface.

Affected Products

• PHP Point of Sale v19.4

Discovery Timeline

• 2026-04-21 - CVE CVE-2025-41011 published to NVD
• 2026-04-21 - Last updated in NVD database

Technical Details for CVE-2025-41011

Vulnerability Analysis

This vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation), commonly known as Cross-Site Scripting. The PHP Point of Sale application fails to properly sanitize user input when processing report generation requests. When a user submits values through the start_date_formatted and end_date_formatted parameters, the application incorporates these values directly into the rendered HTML response without adequate encoding or validation.

The network-based attack vector requires user interaction, meaning an attacker must convince a victim to click a malicious link or visit a crafted page. Once triggered, the injected HTML content executes within the context of the victim's browser session, potentially allowing attackers to modify page content, steal session information through social engineering, or redirect users to malicious sites.

Root Cause

The root cause of this vulnerability lies in the application's failure to implement proper input validation and output encoding for the date parameters in the customer report generation functionality. The start_date_formatted and end_date_formatted parameters are expected to contain date strings but are processed without sanitization, allowing HTML markup to pass through and be rendered in the browser.

Attack Vector

The attack is executed remotely over the network by crafting a malicious URL containing HTML code within the vulnerable date parameters. When a victim accesses the /reports/generate/specific_customer endpoint with attacker-controlled values in the start_date_formatted or end_date_formatted parameters, the injected HTML is rendered in their browser. This could be leveraged to display fake login forms, inject misleading content, or facilitate other social engineering attacks.

The vulnerability exploitation does not require authentication, meaning any user who follows a crafted link could be affected. For detailed technical information about the exploitation mechanism, refer to the INCIBE-CERT security advisory.

Detection Methods for CVE-2025-41011

Indicators of Compromise

• Unusual or malformed date values in web server access logs for the /reports/generate/specific_customer endpoint
• Presence of HTML tags or JavaScript references within start_date_formatted or end_date_formatted URL parameters
• User reports of unexpected content or redirects when accessing customer reports

Detection Strategies

• Implement web application firewall (WAF) rules to detect HTML/script injection patterns in request parameters
• Configure intrusion detection systems to alert on requests containing HTML markup in date fields
• Enable application-level logging for the report generation endpoints and monitor for anomalous input patterns

Monitoring Recommendations

• Review web server logs regularly for requests to /reports/generate/specific_customer containing non-date characters
• Set up alerts for URL-encoded HTML entities (such as %3C, %3E) appearing in date parameters
• Monitor for user complaints about unexpected page content or behavior in the reporting module

How to Mitigate CVE-2025-41011

Immediate Actions Required

• Implement server-side input validation to ensure date parameters contain only valid date formats
• Apply output encoding to all user-supplied data before rendering in HTML responses
• Consider restricting access to the vulnerable endpoint until a patch is available
• Educate users about the risks of clicking unknown or suspicious links

Patch Information

No official vendor patch information is currently available. Organizations should monitor the INCIBE-CERT advisory for updates regarding security patches from the vendor.

Workarounds

• Deploy a web application firewall (WAF) with rules to block requests containing HTML tags in date parameters
• Implement Content Security Policy (CSP) headers to limit the impact of any injected content
• Restrict network access to the reporting module to trusted internal users only
• Add custom input validation at the application or reverse proxy level to sanitize date parameters

# Example Apache mod_rewrite rule to block HTML in date parameters
# Add to .htaccess or Apache configuration
RewriteEngine On
RewriteCond %{QUERY_STRING} (start_date_formatted|end_date_formatted)=.*(<|>|%3C|%3E) [NC]
RewriteRule ^reports/generate/specific_customer - [F,L]