CVE-2025-3822: Pharmacy Management System XSS Vulnerability

CVE-2025-3822 Overview

CVE-2025-3822 is a reflected cross-site scripting (XSS) vulnerability in SourceCodester Web-based Pharmacy Product Management System 1.0. The flaw resides in the changepassword.php script, where the txtconfirm_password, txtnew_password, and txtold_password POST parameters are rendered back to the client without proper output encoding. An authenticated attacker can inject arbitrary HTML or JavaScript that executes in the victim's browser session. The exploit technique has been publicly disclosed, increasing the likelihood of opportunistic use against unpatched deployments. The weakness is categorized under CWE-79: Improper Neutralization of Input During Web Page Generation.

Critical Impact
Successful exploitation allows script execution in the context of an authenticated user's browser, enabling session data theft, credential capture through crafted password-change forms, or targeted phishing against pharmacy operators.

Affected Products

SourceCodester Web-based Pharmacy Product Management System 1.0
Vendor identifier: senior-walter
Affected component: changepassword.php

Discovery Timeline

2025-04-20 - CVE-2025-3822 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-3822

Vulnerability Analysis

The vulnerability affects the password-change workflow of the Web-based Pharmacy Product Management System. When a user submits the change-password form, the application accepts three POST parameters, txtold_password, txtnew_password, and txtconfirm_password, and reflects their values back into the rendered HTML response. Because the values are not HTML-encoded before being written to the page, an attacker who can craft a POST request or lure a logged-in user into submitting one can inject arbitrary script content.

Execution occurs in the browser of the authenticated victim, within the same origin as the pharmacy application. This grants the injected script access to session cookies, DOM contents, and any privileged actions the current user can perform. Because the application handles sensitive pharmacy inventory and user account operations, script injection can be used to pivot into account takeover or data manipulation. Additional technical detail is available in the GitHub XSS Analysis.

Root Cause

The root cause is missing output encoding on user-controlled password fields in changepassword.php. The application echoes submitted values into the HTML response, likely to repopulate the form after validation errors, without applying context-appropriate escaping such as htmlspecialchars(). There is also no input validation to reject characters commonly associated with script injection.

Attack Vector

The attack is network-based and requires an authenticated session with the pharmacy application. An attacker typically hosts a malicious page that auto-submits a crafted POST request to changepassword.php, or convinces a target to click a link that triggers the payload. When the server reflects the injected value, the browser parses and executes the attacker's script. See VulDB entry 305729 for additional context.

Detection Methods for CVE-2025-3822

Indicators of Compromise

Web-server access logs containing POST requests to changepassword.php with parameter values including <script>, onerror=, onload=, or encoded variants such as %3Cscript%3E.
Unexpected outbound requests from client browsers to attacker-controlled domains following a session on the pharmacy application.
Session cookies or authentication tokens appearing in referer headers or query strings sent to third-party hosts.

Detection Strategies

Deploy a web application firewall (WAF) rule set that inspects POST bodies to changepassword.php for HTML tags, JavaScript event handlers, and script scheme URIs.
Enable server-side logging of full POST parameters for the change-password endpoint and alert on payloads matching XSS signatures.
Perform authenticated dynamic application security testing (DAST) against the password-change form using payload lists derived from OWASP XSS filter evasion resources.

Monitoring Recommendations

Monitor for anomalous password-change activity, including repeated submissions from a single session or requests originating from unusual referers.
Track Content Security Policy (CSP) violation reports if a CSP is in place, since injected inline scripts will trigger reports.
Correlate authentication events with subsequent administrative actions to detect session-riding behavior following a suspected XSS trigger.

How to Mitigate CVE-2025-3822

Immediate Actions Required

Restrict access to the pharmacy application to trusted networks or via VPN until a fix is in place, since no vendor patch is currently listed.
Place the application behind a WAF configured to block reflected XSS payloads on changepassword.php parameters.
Rotate credentials for accounts that have accessed the application recently, and invalidate active sessions.

Patch Information

No official vendor patch has been published for CVE-2025-3822 at the time of the latest NVD update. Organizations running SourceCodester Web-based Pharmacy Product Management System 1.0 should track the SourceCodester project page and the VulDB advisory for updates. In the interim, apply source-level fixes by wrapping reflected parameter values with htmlspecialchars($value, ENT_QUOTES, 'UTF-8') in changepassword.php and rejecting inputs containing HTML metacharacters.

Workarounds

Modify changepassword.php locally to stop reflecting txtold_password, txtnew_password, and txtconfirm_password values into the HTML response after form submission.
Add a strict Content Security Policy that disallows inline scripts and restricts script sources to trusted origins, reducing exploit impact.
Enforce the HttpOnly and Secure attributes on session cookies so that injected scripts cannot read them from document.cookie.
Require re-authentication and add anti-CSRF tokens on the password-change form to raise the bar for remote exploitation.