CVE-2026-7269 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 /index.php?page=product endpoint, where the ID parameter is not properly sanitized before being rendered in the application's output. This allows attackers to inject malicious scripts that execute in the context of authenticated users' browsers.
Critical Impact
Attackers can inject malicious JavaScript code via the ID parameter, potentially enabling session hijacking, credential theft, or unauthorized actions within the pharmacy inventory management system.
Affected Products
- SourceCodester Pharmacy Sales and Inventory System 1.0
Discovery Timeline
- 2026-04-28 - CVE CVE-2026-7269 published to NVD
- 2026-04-29 - Last updated in NVD database
Technical Details for CVE-2026-7269
Vulnerability Analysis
This reflected cross-site scripting (XSS) vulnerability (CWE-79) occurs due to improper neutralization of user-supplied input in the product page functionality. When a user accesses the /index.php?page=product endpoint, the ID parameter value is included in the page response without adequate sanitization or encoding. This allows an attacker to craft a malicious URL containing JavaScript payloads that execute when a victim clicks the link or visits the crafted URL.
The exploit has been publicly disclosed, increasing the risk of exploitation in the wild. Healthcare-related applications like pharmacy management systems handle sensitive patient and medication data, making this vulnerability particularly concerning despite its low severity rating.
Root Cause
The root cause of this vulnerability is insufficient input validation and output encoding in the PHP application. The ID parameter is passed directly to the page rendering logic without proper sanitization, escaping, or validation. The application fails to implement proper output encoding mechanisms such as htmlspecialchars() or equivalent functions that would prevent the injection of HTML/JavaScript content into the rendered page.
Attack Vector
The attack is network-accessible and requires an attacker to trick an authenticated user with elevated privileges into clicking a specially crafted malicious link. The URL would contain JavaScript code embedded in the ID parameter. When the victim accesses this link while authenticated to the Pharmacy Sales and Inventory System, the malicious script executes in their browser context. This could enable session token theft, keylogging, phishing attacks via DOM manipulation, or execution of administrative actions on behalf of the victim.
The attack typically involves sending a crafted link via email, messaging platforms, or embedding it in third-party websites. Since this requires high privileges and user interaction, the exploitability is somewhat limited.
Detection Methods for CVE-2026-7269
Indicators of Compromise
- Unusual URL patterns containing <script> tags, javascript: URIs, or encoded payloads in the ID parameter of /index.php?page=product
- Web server logs showing requests with HTML entities or URL-encoded script content in query strings
- Unexpected outbound connections from user browsers to unknown external domains after accessing the pharmacy application
Detection Strategies
- Implement Web Application Firewall (WAF) rules to detect and block requests containing XSS payloads in URL parameters
- Configure intrusion detection systems (IDS) to alert on HTTP requests with common XSS patterns targeting the /index.php endpoint
- Review web server access logs for requests containing suspicious characters like <, >, %3C, %3E, or encoded JavaScript keywords
Monitoring Recommendations
- Enable verbose logging on the web server to capture full query strings for forensic analysis
- Monitor Content Security Policy (CSP) violation reports if implemented, as they may indicate XSS exploitation attempts
- Establish baseline user behavior patterns to detect anomalous actions that may result from successful XSS exploitation
How to Mitigate CVE-2026-7269
Immediate Actions Required
- Apply input validation to the ID parameter to ensure it only accepts expected values (e.g., numeric identifiers)
- Implement proper output encoding using htmlspecialchars() with ENT_QUOTES flag for all user-supplied data rendered in HTML context
- Deploy a Content Security Policy (CSP) header to restrict inline script execution and mitigate XSS impact
- Consider restricting access to the vulnerable endpoint until a patch is available
Patch Information
No official vendor patch has been identified for this vulnerability at the time of publication. Organizations using SourceCodester Pharmacy Sales and Inventory System 1.0 should implement the workarounds below and monitor the SourceCodester website for potential updates. Additional technical details can be found in the VulDB vulnerability entry and the GitHub issue discussion.
Workarounds
- Implement server-side input validation to sanitize the ID parameter before processing
- Add output encoding to all dynamic content rendered from user input using appropriate PHP functions
- Deploy a Web Application Firewall (WAF) with XSS filtering rules to block malicious requests
- Restrict network access to the application to trusted IP ranges where possible
- Educate users about the risks of clicking untrusted links, especially those pointing to internal systems
# Example Apache mod_security rule to block XSS in ID parameter
SecRule ARGS:ID "@rx <[^>]*script" "id:1001,phase:2,deny,status:403,msg:'XSS attempt blocked in ID parameter'"
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