CVE-2026-105705: Drug Recommendation System XSS Vulnerability

CVE-2026-105705 Overview

CVE-2026-105705 is a cross-site scripting (XSS) vulnerability in SourceCodester Drug Recommendation System 1.0. The flaw resides in the Admin/add_drug.php component and allows remote attackers to inject arbitrary script content through unsanitized input. A public exploit has been released, increasing the likelihood of opportunistic abuse against exposed instances.

The weakness is classified under CWE-79, improper neutralization of input during web page generation. Successful exploitation requires user interaction, such as an administrator viewing a tampered record, and can result in session theft, credential capture, or redirection to attacker-controlled infrastructure.

Critical Impact

Attackers can execute arbitrary JavaScript in the context of an administrator session, enabling account takeover and manipulation of drug records within the application.

Affected Products

• SourceCodester Drug Recommendation System 1.0
• Component: Admin/add_drug.php
• Deployments: PHP-based web application instances exposed to untrusted users

Discovery Timeline

• 2026-10-06 - CVE CVE-2026-105705 published to NVD
• 2026-10-06 - Last updated in NVD database

Technical Details for CVE-2026-105705

Vulnerability Analysis

The vulnerability resides in the administrative drug management workflow of the Drug Recommendation System. The Admin/add_drug.php endpoint accepts user-supplied input without applying contextual output encoding or input sanitization. When the application later renders this input in HTML responses, embedded JavaScript executes in the victim's browser.

Both reflected and stored XSS behaviors have been reported for this endpoint, according to the GitHub Vulnerability Report. Stored variants persist payloads inside the backend database, triggering script execution each time an administrator views the affected record. Reflected variants fire when a crafted link is opened by an authenticated user.

The EPSS score of 0.27% suggests limited observed exploitation activity. However, publication of a working exploit lowers the barrier for attackers targeting internet-exposed instances.

Root Cause

The root cause is missing input validation and output encoding on parameters processed by Admin/add_drug.php. The PHP code concatenates user input directly into HTML without using functions such as htmlspecialchars() or a templating engine with automatic escaping. This classic [CWE-79] pattern allows attacker-controlled markup to be interpreted as executable script.

Attack Vector

The attack is network-reachable and requires user interaction. An attacker submits a payload containing JavaScript through the vulnerable form fields. When an administrator or authorized user accesses the affected page, the script runs under the application's origin. Payloads can exfiltrate session cookies, perform authenticated actions on behalf of the victim, or deliver secondary payloads such as a browser-targeted drive-by.

See the VulDB entry for CVE-2026-105705 and the VulDB Vulnerability #413698 record for additional technical context.

Detection Methods for CVE-2026-105705

Indicators of Compromise

• HTTP POST requests to Admin/add_drug.php containing <script>, onerror=, onload=, or javascript: substrings in form fields
• Database records in the drug catalog containing HTML tags or JavaScript event handlers
• Unexpected outbound requests from administrator browsers to unfamiliar domains shortly after accessing drug management pages
• Session cookies observed in web server referrer logs or external telemetry

Detection Strategies

• Deploy a web application firewall (WAF) rule set that inspects POST bodies to add_drug.php for XSS payload signatures
• Review stored drug records for HTML or script content that should not exist in a well-formed drug name or description field
• Correlate administrator authentication events with anomalous JavaScript-triggered outbound connections

Monitoring Recommendations

• Enable verbose HTTP access logging on the PHP application server and retain full request bodies for the admin interface
• Monitor browser Content Security Policy (CSP) violation reports if CSP is enforced
• Alert on administrator sessions originating from unexpected IP addresses or user agents following suspicious page loads

How to Mitigate CVE-2026-105705

Immediate Actions Required

• Restrict access to the Admin/ directory using network ACLs, VPN, or IP allow-listing until a patch is applied
• Audit all existing drug records for stored payloads and remove any entries containing HTML or JavaScript
• Rotate administrative credentials and invalidate active sessions if compromise is suspected
• Enforce multi-factor authentication on administrator accounts to limit the value of stolen session cookies

Patch Information

No official vendor patch has been published at the time of CVE assignment. SourceCodester distributes the application through the SourceCodester Resource Library. Operators should monitor the vendor site for updates and apply source-level fixes in the interim.

Workarounds

• Apply htmlspecialchars($input, ENT_QUOTES, 'UTF-8') to all user-supplied values rendered in HTML output within add_drug.php and related admin templates
• Validate input server-side with a strict allow-list for drug name, dosage, and description fields
• Deploy a Content Security Policy that disallows inline scripts and restricts script sources to trusted origins
• Place the application behind a WAF with signatures tuned for reflected and stored XSS

# Example Content Security Policy header for Apache
Header set Content-Security-Policy "default-src 'self'; script-src 'self'; object-src 'none'; base-uri 'self'; frame-ancestors 'none'"
Header set X-XSS-Protection "1; mode=block"
Header set X-Content-Type-Options "nosniff"