CVE-2026-7390 Overview
A Cross-Site Scripting (XSS) vulnerability has been identified in SourceCodester Pharmacy Sales and Inventory System version 1.0. The vulnerability exists in the Customer function within the /index.php?page=customer file. An attacker can manipulate the Name argument to inject malicious scripts that execute in the context of a victim's browser session. The attack can be launched remotely, and a public exploit is available.
Critical Impact
Attackers can inject malicious JavaScript code through the customer name field, potentially enabling session hijacking, credential theft, or unauthorized actions within the pharmacy management system.
Affected Products
- SourceCodester Pharmacy Sales and Inventory System 1.0
Discovery Timeline
- 2026-04-29 - CVE CVE-2026-7390 published to NVD
- 2026-04-29 - Last updated in NVD database
Technical Details for CVE-2026-7390
Vulnerability Analysis
This vulnerability is classified as CWE-79: Improper Neutralization of Input During Web Page Generation (Cross-Site Scripting). The affected component fails to properly sanitize user-supplied input in the Name parameter before rendering it in the web page output. When a user submits a customer record with a malicious payload in the name field, the application stores and subsequently displays this unsanitized content to other users viewing customer records.
The attack requires low privileges (an authenticated user) and user interaction (a victim must view the affected page), but can be executed remotely over the network. This is a stored XSS vulnerability, meaning the malicious payload persists in the application's database and affects any user who views the compromised customer record.
Root Cause
The root cause is insufficient input validation and output encoding in the Customer function located at /index.php?page=customer. The application directly incorporates user-supplied data from the Name argument into the HTML response without proper sanitization or encoding. This allows attackers to break out of the expected data context and inject arbitrary HTML or JavaScript code.
Attack Vector
The attack vector is network-based, requiring an authenticated attacker to submit a crafted payload through the customer management interface. The attacker injects malicious JavaScript code into the Name field when creating or editing a customer record. When other users (including administrators) view the customer list or details page, the malicious script executes in their browser context.
This can lead to:
- Session token theft via document.cookie access
- Keylogging and credential capture
- Defacement of the application interface
- Phishing attacks displayed within the trusted application context
- Unauthorized actions performed on behalf of the victim user
Technical details and proof-of-concept information can be found in the GitHub Issue Discussion and VulDB Vulnerability Entry #360115.
Detection Methods for CVE-2026-7390
Indicators of Compromise
- Unusual JavaScript code or HTML tags present in customer name fields within the database
- Customer records containing script tags, event handlers (e.g., onerror, onload), or encoded JavaScript payloads
- Web server logs showing requests to /index.php?page=customer with suspicious characters in the Name parameter
Detection Strategies
- Deploy Web Application Firewall (WAF) rules to detect and block XSS payloads in HTTP request parameters
- Implement database monitoring to alert on customer records containing script tags or JavaScript event handlers
- Enable Content Security Policy (CSP) headers with violation reporting to detect attempted script injection
Monitoring Recommendations
- Review web application logs for patterns indicative of XSS probing, such as angle brackets, script tags, and JavaScript event handlers in form submissions
- Monitor for unusual session behavior that may indicate session hijacking following successful XSS exploitation
- Implement real-time alerting for CSP violations originating from the customer management pages
How to Mitigate CVE-2026-7390
Immediate Actions Required
- Implement server-side input validation to reject or sanitize special characters in the Name parameter
- Apply output encoding (HTML entity encoding) when rendering customer names in the web interface
- Deploy Content Security Policy headers to mitigate the impact of any successful XSS attacks
- Review existing customer records in the database for malicious content and sanitize as needed
Patch Information
No official vendor patch has been released at the time of this publication. Organizations using SourceCodester Pharmacy Sales and Inventory System 1.0 should contact the vendor through SourceCodester for security updates. Additional vulnerability details are available via VulDB Submission #803105.
Workarounds
- Implement a WAF rule to filter XSS payloads targeting the /index.php?page=customer endpoint
- Manually patch the Customer function to add htmlspecialchars() or equivalent output encoding when displaying the Name field
- Restrict access to the customer management functionality to trusted administrators only until a fix is available
- Consider deploying the application behind a reverse proxy with XSS filtering capabilities
# Example: Add Content Security Policy header in Apache configuration
# Add to .htaccess or Apache virtual host configuration
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'"
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
