CVE-2026-15498: SmartHomeAdatum SQL Injection Vulnerability

CVE-2026-15498 Overview

CVE-2026-15498 is a SQL injection vulnerability in the sergomanov SmartHomeAdatum project, affecting commits up to cf495353d81b680675eb8d9aa14a318aa45ce12c. The flaw resides in the users.php file within the Login component. Attackers can manipulate the Login argument to inject arbitrary SQL statements. The vulnerability is exploitable remotely without authentication or user interaction. SmartHomeAdatum operates on a rolling release model, so no fixed version identifier exists. The vendor was contacted before public disclosure but did not respond. This vulnerability is categorized under [CWE-74] (Improper Neutralization of Special Elements in Output Used by a Downstream Component).

Critical Impact
Unauthenticated attackers can inject SQL commands through the Login parameter, potentially exposing credentials and user data stored in the backend database.

Affected Products

sergomanov SmartHomeAdatum (rolling release)
All commits up to cf495353d81b680675eb8d9aa14a318aa45ce12c
The users.php Login component

Discovery Timeline

2026-07-12 - CVE-2026-15498 published to NVD
2026-07-13 - Last updated in NVD database

Technical Details for CVE-2026-15498

Vulnerability Analysis

The vulnerability exists in the authentication path of SmartHomeAdatum, specifically in users.php. The application passes the Login argument directly into a SQL query without proper sanitization or parameterization. An attacker submits crafted input through the login form to alter query semantics.

Because the vulnerable code path is reachable pre-authentication, exploitation requires no prior credentials. The attack vector is Network, meaning any user able to reach the login page can attempt exploitation. The EPSS probability is 0.254% with a percentile of 16.9, reflecting moderate real-world exploitation likelihood.

Root Cause

The root cause is improper neutralization of special characters in the Login parameter before it reaches the SQL interpreter. The application concatenates user-supplied input directly into query strings rather than using prepared statements or parameterized queries. This design flaw enables classic SQL injection techniques such as boolean-based, UNION-based, and time-based blind extraction.

Attack Vector

An unauthenticated remote attacker sends a crafted HTTP request to the login endpoint. By supplying SQL metacharacters in the Login field, the attacker breaks out of the intended query context and appends arbitrary SQL. Successful exploitation can lead to authentication bypass, extraction of user records, disclosure of password hashes, or manipulation of application data. The vulnerability affects confidentiality, integrity, and availability at a limited level according to the CVSS 4.0 vector.

See the VulDB entry for CVE-2026-15498 for additional technical context.

Detection Methods for CVE-2026-15498

Indicators of Compromise

Web server access logs containing SQL metacharacters (', --, UNION, SLEEP, OR 1=1) in POST requests to users.php.
Anomalous authentication failures followed by successful logins from the same source IP.
Database logs showing malformed or unusually long queries originating from the login handler.

Detection Strategies

Deploy Web Application Firewall (WAF) rules that flag SQL injection payloads targeting the Login parameter in users.php.
Enable database query auditing to identify queries deviating from expected authentication templates.
Correlate HTTP request patterns with database errors to surface injection attempts in progress.

Monitoring Recommendations

Forward web server and database logs to a centralized analytics platform for correlation and long-term retention.
Establish baselines for typical login request payload sizes and character distributions, alerting on deviations.
Monitor outbound network connections from the application server for signs of data exfiltration following suspicious login activity.

How to Mitigate CVE-2026-15498

Immediate Actions Required

Restrict network access to the SmartHomeAdatum login interface using firewall rules or VPN gating until a fix is available.
Deploy WAF signatures that block SQL injection payloads targeting users.php and the Login parameter.
Audit the application database for unauthorized changes, new accounts, or extracted user records.

Patch Information

No official patch is available. The vendor did not respond to disclosure attempts. Because SmartHomeAdatum uses a rolling release model, operators should monitor the upstream repository for commits addressing the users.php Login handler and apply fixes as they appear. Refer to the VulDB advisory for tracking updates.

Workarounds

Modify users.php locally to use parameterized queries or prepared statements for all database operations involving the Login parameter.
Apply strict server-side input validation, rejecting non-alphanumeric characters in login identifiers where feasible.
Enforce least-privilege database accounts so the application user cannot read or modify sensitive tables outside its scope.

bash

# Example: hardening PHP PDO login query with prepared statements
$stmt = $pdo->prepare('SELECT id, password_hash FROM users WHERE login = :login');
$stmt->bindParam(':login', $_POST['Login'], PDO::PARAM_STR);
$stmt->execute();
$row = $stmt->fetch(PDO::FETCH_ASSOC);