CVE-2026-94033: Drug Recommendation System XSS Vulnerability

CVE-2026-94033 Overview

CVE-2026-94033 is a cross-site scripting (XSS) vulnerability in SourceCodester Drug Recommendation System 1.0. The flaw resides in the /drug_recommender/Admin/add_user endpoint within the User Management component. Attackers can manipulate the txtname, txtemail, or txtpassword parameters to inject arbitrary script content. The issue is classified under [CWE-79] (Improper Neutralization of Input During Web Page Generation).

The vulnerability is exploitable remotely and requires low privileges plus user interaction. Public disclosure of the exploit details has occurred through VulDB and a GitHub proof-of-concept repository.

Critical Impact

Authenticated attackers can inject JavaScript that executes in the browsers of administrators viewing the User Management interface, enabling session theft, credential capture, or administrative action forgery.

Affected Products

• SourceCodester Drug Recommendation System 1.0
• Component: User Management (/drug_recommender/Admin/add_user)
• Vulnerable parameters: txtname, txtemail, txtpassword

Discovery Timeline

• 2026-09-20 - CVE-2026-94033 published to NVD
• 2026-09-21 - Last updated in NVD database

Technical Details for CVE-2026-94033

Vulnerability Analysis

The vulnerability exists in the administrator-side user creation workflow of the Drug Recommendation System. When an authenticated user submits data to the add_user endpoint, the application stores or reflects the txtname, txtemail, and txtpassword values without proper output encoding. Any subsequent rendering of that data in an HTML context executes attacker-supplied script.

Because the injection point lies in an administrative user-management page, the injected payload typically executes in an administrator's session. This creates a path to privilege abuse: the attacker's script can perform requests on behalf of a higher-privileged account. The attack requires authenticated access to the form and interaction from a victim who views the affected page.

Root Cause

The root cause is missing input validation and output encoding on user-controlled parameters processed by the add_user handler. The application accepts raw HTML and JavaScript in fields intended for plain text (name, email, password). No context-aware encoding is applied when the values are rendered back into the DOM, allowing script tags and event handlers to execute.

Attack Vector

An authenticated attacker submits a crafted POST request to /drug_recommender/Admin/add_user with a JavaScript payload embedded in the txtname, txtemail, or txtpassword field. When an administrator later views the user list or user detail page, the browser parses the payload as executable script. The attacker can then exfiltrate session cookies, submit forged administrative requests, or pivot into further application abuse.

No verified exploit code is published in a controlled repository beyond the referenced proof-of-concept documentation. See the GitHub Project Documentation and VulDB CVE-2026-94033 for technical details.

Detection Methods for CVE-2026-94033

Indicators of Compromise

• POST requests to /drug_recommender/Admin/add_user containing HTML tags, <script> elements, or javascript: URIs in the txtname, txtemail, or txtpassword parameters.
• Stored user records where name, email, or password fields contain angle brackets, event handler attributes (onerror, onload), or encoded script fragments.
• Unexpected outbound requests from administrator browsers to attacker-controlled domains shortly after viewing the User Management page.

Detection Strategies

• Deploy web application firewall (WAF) rules that inspect form submissions to add_user for XSS signatures and known payload patterns.
• Audit the users table in the database for stored values containing HTML metacharacters that would not appear in legitimate user records.
• Correlate administrator session activity with anomalous DOM-based network requests originating from the User Management page.

Monitoring Recommendations

• Enable verbose HTTP request logging on the /drug_recommender/Admin/ path and forward logs to a centralized analytics platform.
• Monitor for repeated failed or malformed submissions to add_user from the same authenticated source.
• Configure alerts on Content Security Policy (CSP) violation reports if CSP is deployed in report-only mode.

How to Mitigate CVE-2026-94033

Immediate Actions Required

• Restrict access to the /drug_recommender/Admin/ interface to trusted administrative IP ranges using network controls.
• Review the users table for stored payloads and sanitize any records containing HTML or script content.
• Rotate administrator session tokens and credentials if suspicious activity is observed.

Patch Information

No vendor patch has been published for SourceCodester Drug Recommendation System 1.0 at the time of NVD publication. Consult the VulDB Vulnerability #407961 entry and the SourceCodester Resource Hub for updates. Organizations running this application should apply mitigations at the application or infrastructure layer until an official fix is available.

Workarounds

• Implement server-side input validation that rejects HTML metacharacters in the txtname, txtemail, and txtpassword parameters.
• Apply context-aware output encoding when rendering user data in HTML, attribute, or JavaScript contexts.
• Deploy a strict Content Security Policy that blocks inline script execution and restricts script sources to trusted origins.
• Place the application behind a WAF configured with OWASP Core Rule Set protections for reflected and stored XSS.

# Example nginx WAF snippet blocking script tags in add_user submissions
location /drug_recommender/Admin/add_user {
    if ($request_body ~* "(<script|javascript:|onerror=|onload=)") {
        return 403;
    }
    proxy_pass http://backend;
}