CVE-2025-56018: Pharmacy Management System XSS Vulnerability

CVE-2025-56018 Overview

CVE-2025-56018 is a stored Cross-Site Scripting (XSS) vulnerability affecting SourceCodester Web-based Pharmacy Product Management System version 1.0. The flaw resides in the Category Management module, where the category name input field fails to sanitize user-supplied data before rendering it in the browser. An authenticated attacker can inject JavaScript payloads that execute in the context of any user who views the category listing. The vulnerability is tracked under CWE-79 and was published to the National Vulnerability Database on September 30, 2025.

Critical Impact
Attackers can execute arbitrary JavaScript in victim browsers, enabling session hijacking, credential theft, and unauthorized actions against pharmacy management workflows.

Affected Products

SourceCodester Web-based Pharmacy Product Management System version 1.0
Deployments using the senior-walter:web-based_pharmacy_product_management_system:1.0 component
Any downstream forks that retain the vulnerable Category Management handler

Discovery Timeline

2025-09-30 - CVE-2025-56018 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-56018

Vulnerability Analysis

The vulnerability is a stored Cross-Site Scripting (XSS) flaw in the Category Management feature of the SourceCodester Web-based Pharmacy Product Management System. The application accepts a category name from an authenticated user and persists it to the backend database without applying output encoding or input sanitization. When the stored value is later rendered in HTML pages such as the category list or product management views, the browser interprets the payload as executable script.

The issue is classified under CWE-79: Improper Neutralization of Input During Web Page Generation. Because the payload is stored server-side, every user session that loads the affected view triggers the script. This differs from reflected XSS, which requires an attacker to deliver a crafted link to each victim.

Successful exploitation allows an attacker to steal session cookies, perform actions on behalf of administrators, redirect users to attacker-controlled hosts, or deface application pages. Given that pharmacy management systems handle sensitive product and transactional data, script execution in an administrator context can lead to broader data compromise.

Root Cause

The root cause is missing server-side input validation and missing output encoding on the category name field. Neither an allowlist for permitted characters nor HTML entity encoding is applied before the value is written back into the DOM.

Attack Vector

An authenticated user with access to the Category Management interface submits a category containing an HTML or JavaScript payload, for example a <script> tag or an event handler such as onerror on an image element. The payload is stored in the database. When any user, including higher-privileged administrators, loads a page that renders the category name, the injected script executes in their browser session. Refer to the security researcher's write-up for the disclosed payload structure.

Detection Methods for CVE-2025-56018

Indicators of Compromise

Category records containing HTML tags such as <script>, <img>, <svg>, or <iframe> in the category name column
Unexpected outbound requests from administrator browsers to unfamiliar domains shortly after loading category views
Session cookie access or exfiltration events originating from the pharmacy application origin
New or modified category entries created by low-privileged accounts

Detection Strategies

Review the database table storing category names for entries containing angle brackets, event handler attributes, or JavaScript URI schemes
Enable Content Security Policy (CSP) violation reporting to surface inline script execution attempts on category pages
Inspect web server access logs for POST requests to the category management endpoint containing encoded script payloads
Correlate administrator session activity with browser-side script errors that may indicate injected payload execution

Monitoring Recommendations

Alert on database writes to the categories table that include reserved HTML characters
Monitor for anomalous DOM modifications and cross-origin fetch requests originating from authenticated application sessions
Track authentication events immediately following administrator visits to Category Management pages for signs of session replay

How to Mitigate CVE-2025-56018

Immediate Actions Required

Restrict access to the Category Management interface to trusted administrators until a fix is deployed
Audit existing category records and remove any entries containing HTML or script content
Deploy a Web Application Firewall (WAF) rule to block requests containing common XSS payload patterns to the category endpoint
Force a password reset and session invalidation for any account that may have viewed a malicious category entry

Patch Information

No official vendor patch is listed in the CVE record at the time of publication. Administrators should track the project repository for updates and apply source-level fixes that add input validation and output encoding to the Category Management handler. Details are available in the disclosure write-up on Medium.

Workarounds

Apply HTML entity encoding on the category name field before rendering, using functions such as htmlspecialchars($value, ENT_QUOTES, 'UTF-8') in PHP
Enforce a strict allowlist that permits only alphanumeric characters, spaces, and a limited punctuation set in category names
Deploy a Content Security Policy header that disallows inline scripts and restricts script sources to trusted origins
Set the HttpOnly and Secure flags on session cookies to reduce the impact of cookie theft through injected scripts

bash

# Example CSP header to mitigate inline script execution
Content-Security-Policy: default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'

# Example session cookie hardening in PHP
session_set_cookie_params([
    'httponly' => true,
    'secure'   => true,
    'samesite' => 'Strict'
]);