Attack Chain

1. Attacker identifies a vulnerable sergomanov SmartHomeAdatum instance accessible via the internet.
2. Attacker targets the users.php script, which handles authentication via the "Login" component.
3. Attacker crafts a malicious HTTP request (GET or POST) containing SQL injection payloads embedded within the Login argument.
4. The vulnerable SmartHomeAdatum application receives the request and processes the Login argument without proper input sanitization.
5. The malicious SQL query is executed on the backend database as part of the application's authentication logic.
6. Attacker gains unauthorized access to sensitive data (e.g., user credentials, system configuration) or manipulates existing data in the database.

Impact

Successful exploitation of CVE-2026-15498 allows remote attackers to execute arbitrary SQL queries against the underlying database. This can lead to unauthorized access to sensitive information, such as user credentials, system configurations, and other proprietary data stored within the SmartHomeAdatum environment. Attackers could potentially modify or delete data, affecting data integrity and availability. In some database configurations, successful SQL injection could even pave the way for remote code execution (RCE), enabling attackers to gain full control over the compromised server. The lack of vendor response means there is no official patch, leaving all instances up to the specified commit vulnerable to these severe consequences.

Recommendation

• Deploy the provided Sigma rule to your SIEM to detect exploitation attempts targeting the users.php endpoint with SQL injection payloads.
• Implement a Web Application Firewall (WAF) to filter and block common SQL injection patterns in HTTP requests, specifically targeting parameters like Login for users.php.
• Regularly review web server access logs for users.php for unusual activity, especially requests containing special characters or SQL keywords in the query string.
• As no patch is available for CVE-2026-15498, consider isolating affected sergomanov SmartHomeAdatum instances from direct internet access or implementing stringent network segmentation until a fix is released.