CVE-2026-14656: Assessment Management 1.0 XSS Vulnerability

CVE-2026-14656 Overview

CVE-2026-14656 is a cross-site scripting (XSS) vulnerability affecting code-projects Assessment Management 1.0. The flaw resides in the /admin/remove-user.php script, where the ID parameter is not properly sanitized before being reflected in application output. An unauthenticated remote attacker can craft a malicious URL that, when opened by an administrator, executes arbitrary JavaScript in the victim's browser session. The exploit details have been publicly disclosed, increasing the likelihood of opportunistic attempts. The vulnerability is classified under CWE-79 (Improper Neutralization of Input During Web Page Generation).

Critical Impact
Successful exploitation allows attackers to execute arbitrary JavaScript in the context of an authenticated administrator, enabling session theft, unauthorized administrative actions, and phishing against portal users.

Affected Products

code-projects Assessment Management 1.0
Component: /admin/remove-user.php
Vulnerable parameter: ID

Discovery Timeline

2026-07-04 - CVE-2026-14656 published to NVD
2026-07-06 - Last updated in NVD database

Technical Details for CVE-2026-14656

Vulnerability Analysis

The vulnerability is a reflected cross-site scripting flaw in the administrative user removal workflow of code-projects Assessment Management 1.0. When a request is made to /admin/remove-user.php, the application accepts an ID query parameter that is echoed back into the response without proper output encoding or input validation. An attacker who tricks an authenticated administrator into visiting a crafted link can execute arbitrary JavaScript in the administrator's browser. Because the endpoint sits within the /admin/ directory, the executed script runs with access to administrator session cookies and any privileged application state.

The attack requires user interaction (UI:P in the CVSS 4.0 vector) but no authentication or elevated privileges from the attacker. The impact is limited to integrity of application data reflected in the browser, with no direct impact on confidentiality or availability of the server backend.

Root Cause

The root cause is the failure to neutralize special characters in the ID parameter before including it in the HTML response. The application does not apply context-appropriate output encoding (such as HTML entity encoding) nor does it enforce a strict allow-list on the expected numeric identifier. This deviates from standard secure development practice for PHP web applications handling user-supplied input.

Attack Vector

Exploitation is performed remotely over the network. An attacker constructs a URL of the form /admin/remove-user.php?ID=<payload>, where <payload> contains a JavaScript payload such as an inline <script> tag or event handler. The attacker delivers the URL to an administrator through phishing email, social engineering, or a link embedded in another compromised page. When the administrator clicks the link while authenticated to the application, the payload executes in the browser and can exfiltrate cookies, invoke administrative endpoints, or modify displayed content. Technical details are available in the GitHub CVE Assessment Document and the VulDB CVE Details entry.

Detection Methods for CVE-2026-14656

Indicators of Compromise

HTTP requests to /admin/remove-user.php containing <, >, script, onerror, onload, or URL-encoded equivalents (%3C, %3E) in the ID parameter.
Web server access logs showing unusually long or non-numeric values in the ID query string parameter.
Referer headers pointing to external or untrusted domains preceding requests to admin endpoints.

Detection Strategies

Deploy web application firewall (WAF) rules that inspect the ID parameter for HTML tags, JavaScript keywords, and encoded XSS payloads.
Enable and centralize PHP application access logging, then hunt for parameter values that fail numeric validation on admin endpoints.
Correlate admin session activity with anomalous JavaScript-triggered API calls that do not match normal administrator workflows.

Monitoring Recommendations

Monitor for repeated 200-status responses to /admin/remove-user.php from a single source with varying ID payloads, indicating payload probing.
Alert on browser-side Content Security Policy (CSP) violation reports originating from administrative pages.
Track outbound requests from administrator workstations to unfamiliar domains shortly after loading the admin console.

How to Mitigate CVE-2026-14656

Immediate Actions Required

Restrict access to /admin/remove-user.php at the web server or reverse proxy layer to trusted administrator IP ranges until a fix is applied.
Instruct administrators to avoid clicking untrusted links while authenticated to the Assessment Management portal and to use a dedicated browser profile for administrative work.
Enforce a strict Content Security Policy that disallows inline scripts on administrative pages to reduce the impact of reflected XSS.

Patch Information

No vendor patch has been referenced in the published advisory sources at the time of writing. Users of code-projects Assessment Management 1.0 should monitor the code-projects vendor site and the VulDB Vulnerability Summary for updates. Until an official fix is released, apply the workarounds below and consider retiring or replacing the affected application in production environments.

Workarounds

Modify /admin/remove-user.php to cast the ID parameter to an integer using intval() before use, and reject non-numeric input with a 400 response.
Apply HTML entity encoding via htmlspecialchars($id, ENT_QUOTES, 'UTF-8') on any reflected output derived from the ID parameter.
Deploy a WAF rule blocking requests to /admin/remove-user.php when the ID parameter contains characters outside [0-9].

bash

# Example ModSecurity rule to block non-numeric ID values on the affected endpoint
SecRule REQUEST_URI "@beginsWith /admin/remove-user.php" \
    "chain,phase:2,deny,status:400,id:1026146560,msg:'CVE-2026-14656 XSS attempt blocked'"
    SecRule ARGS:ID "!@rx ^[0-9]+$" "t:none"