CVE-2026-94034: Drug Recommendation System XSS Vulnerability

CVE-2026-94034 Overview

CVE-2026-94034 is a reflected cross-site scripting (XSS) vulnerability affecting SourceCodester Drug Recommendation System 1.0. The flaw resides in the password change component reachable at /drug_recommender/Admin/change_password. Attackers can inject malicious script content through the txtoldpassword and txtnewpassword parameters. The issue is classified under [CWE-79] for improper neutralization of input during web page generation. A public exploit has been disclosed, increasing the likelihood of opportunistic exploitation against exposed installations.

Critical Impact
An authenticated attacker can execute arbitrary JavaScript in an administrator's browser session by manipulating password change parameters, enabling session theft or admin-context actions.

Affected Products

SourceCodester Drug Recommendation System 1.0
Password Change component at /drug_recommender/Admin/change_password
Parameters txtoldpassword and txtnewpassword

Discovery Timeline

2026-09-20 - CVE-2026-94034 published to NVD
2026-09-21 - Last updated in NVD database

Technical Details for CVE-2026-94034

Vulnerability Analysis

The vulnerability is a reflected cross-site scripting flaw in the administrative password change workflow of the Drug Recommendation System. Input supplied to the txtoldpassword and txtnewpassword form fields is echoed back to the response without proper output encoding or input sanitization. When an authenticated administrator submits crafted content, the server renders the payload directly into the HTML response, causing the browser to execute attacker-controlled JavaScript. Exploitation requires user interaction, typically achieved through a crafted link or a malicious form autosubmitted from an attacker-controlled page.

Root Cause

The root cause is missing output encoding on user-controlled parameters returned by the change_password handler. The application places request values into the HTML response context without applying HTML entity encoding, violating standard [CWE-79] mitigations. Without server-side validation or a Content Security Policy, any script content in the request parameters becomes executable in the administrator's browser context.

Attack Vector

The attack requires network access to the application and low-privilege credentials, plus interaction from a targeted user. An attacker crafts a URL or HTML form targeting the /drug_recommender/Admin/change_password endpoint with script payloads in txtoldpassword or txtnewpassword. When the victim submits the request, the reflected payload executes in their browser session. Successful exploitation enables session cookie theft, unauthorized administrative actions, or delivery of secondary payloads. Refer to the GitHub XSS Vulnerability README and VulDB CVE-2026-94034 for the public proof of concept.

Detection Methods for CVE-2026-94034

Indicators of Compromise

HTTP POST requests to /drug_recommender/Admin/change_password containing <script>, onerror=, onload=, or javascript: substrings in the txtoldpassword or txtnewpassword parameters.
Web server access logs showing URL-encoded script payloads such as %3Cscript%3E targeting the password change endpoint.
Unexpected outbound requests from administrator browsers to unknown domains shortly after visiting the admin panel.

Detection Strategies

Deploy a web application firewall rule that inspects form fields for common XSS signatures on the change_password route.
Enable server-side request logging that captures full POST bodies for administrative endpoints to support forensic review.
Correlate admin authentication events with anomalous JavaScript execution reported by browser telemetry or CSP violation reports.

Monitoring Recommendations

Monitor for repeated failed or malformed password change submissions originating from a single source address.
Alert on administrator session cookies used from multiple geographic locations within short time windows.
Track HTTP referer headers pointing to external domains on requests hitting /drug_recommender/Admin/change_password.

How to Mitigate CVE-2026-94034

Immediate Actions Required

Restrict access to the /drug_recommender/Admin/ path to trusted administrative networks or via VPN.
Instruct administrators to avoid clicking untrusted links while authenticated to the application.
Deploy a Content Security Policy that disallows inline scripts on administrative pages.

Patch Information

No vendor patch has been published in the referenced advisories at the time of NVD publication. Administrators should apply output encoding on the txtoldpassword and txtnewpassword parameters within the change_password handler and validate all user input server-side. Track updates through VulDB Vulnerability #407962 and the SourceCodester Resource Repository.

Workarounds

Implement a reverse-proxy WAF rule that blocks requests containing HTML or script metacharacters in password change parameters.
Add a strict Content-Security-Policy response header limiting script sources to 'self' on all admin routes.
Enforce short administrator session lifetimes and require re-authentication for sensitive operations.

bash

# Example NGINX configuration adding a restrictive CSP and blocking script payloads
location /drug_recommender/Admin/ {
    add_header Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'" always;
    add_header X-XSS-Protection "1; mode=block" always;

    if ($args ~* "(<|%3C)script") { return 403; }
    if ($request_body ~* "(<|%3C)script") { return 403; }

    proxy_pass http://backend;
}