CVE-2026-14640: Apartment Visitor Management SQL Injection

CVE-2026-14640 Overview

CVE-2026-14640 is a SQL injection vulnerability in CodeAstro Apartment Visitor Management System 1.0. The flaw resides in the login component handled by /index.php, where the Username parameter is passed to the backend database without proper sanitization. Attackers can manipulate this argument to alter the SQL query executed by the application. Exploitation is possible remotely without authentication and requires no user interaction. Public disclosure of the exploit technique increases the likelihood of opportunistic scanning and abuse against exposed installations. The weakness is classified under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component).

Critical Impact
Unauthenticated attackers can inject SQL statements through the login form, potentially bypassing authentication and reading or modifying data stored in the application database.

Affected Products

CodeAstro Apartment Visitor Management System 1.0
Component: Login (/index.php)
Parameter: Username

Discovery Timeline

2026-07-04 - CVE-2026-14640 published to NVD
2026-07-06 - Last updated in NVD database

Technical Details for CVE-2026-14640

Vulnerability Analysis

The vulnerability affects the login handler in /index.php of CodeAstro Apartment Visitor Management System 1.0. The application constructs a SQL query using the Username value received from the login form without applying parameterized queries or input sanitization. When an attacker supplies crafted SQL syntax within this field, the resulting query executes attacker-controlled logic against the backend database. The issue is reachable over the network and does not require prior authentication, since the login page is exposed to any user who can access the web application. Public disclosure of the exploit lowers the technical barrier for abuse.

Root Cause

The root cause is improper neutralization of user-supplied input before it is concatenated into an SQL query [CWE-74]. The Username parameter is trusted as literal data but is instead interpreted by the database engine as query syntax. This class of flaw typically stems from string concatenation patterns such as building queries with the raw request parameter instead of using prepared statements with bound parameters.

Attack Vector

An attacker sends an HTTP POST request to /index.php with a manipulated Username field containing SQL metacharacters. Payloads such as tautology-based conditions can force the query to return a true result, enabling authentication bypass. Union-based or error-based payloads can extract data from other tables. Because the endpoint is remotely reachable and unauthenticated, exploitation only requires network access to the application.

No verified proof-of-concept code has been published to a trusted repository. Technical details are tracked in the GitHub CVE Issue Tracker and VulDB CVE-2026-14640.

Detection Methods for CVE-2026-14640

Indicators of Compromise

HTTP POST requests to /index.php containing SQL metacharacters such as ', --, #, UNION, or OR 1=1 in the Username field.
Web server logs showing repeated failed login attempts followed by a successful session from the same source IP.
Unexpected database errors returned by the application that reference SQL syntax or table structures.

Detection Strategies

Deploy web application firewall (WAF) signatures that inspect POST bodies to /index.php for SQL injection patterns targeting the Username parameter.
Enable database query logging and alert on anomalous queries originating from the application account, such as queries containing UNION SELECT or comment terminators.
Correlate authentication events with the source request payload to flag logins that occurred without a valid credential comparison path.

Monitoring Recommendations

Monitor the web server access logs for high-volume login requests with abnormal Username payload lengths or non-printable characters.
Track outbound database traffic from the application host for spikes that may indicate data exfiltration through injection.
Alert on new administrative sessions or privilege changes in the application database following suspicious login activity.

How to Mitigate CVE-2026-14640

Immediate Actions Required

Restrict network exposure of the Apartment Visitor Management System login page to trusted networks or place it behind a VPN until a fix is available.
Deploy WAF rules that block SQL injection patterns targeting /index.php and the Username parameter.
Rotate database credentials used by the application and review recent authentication logs for signs of exploitation.

Patch Information

At the time of publication, no vendor patch has been referenced in the NVD entry. Consult the CodeAstro Security Resource for vendor updates and monitor VulDB Vulnerability #376156 for revised advisory information.

Workarounds

Refactor the login query in /index.php to use parameterized statements or prepared queries with bound variables instead of string concatenation.
Apply server-side input validation that rejects non-alphanumeric characters in the Username field before the value reaches the database layer.
Enforce least-privilege permissions on the database account used by the application so injection cannot escalate into schema modification or data exfiltration.