CVE-2025-6871 is a critical SQL Injection vulnerability identified in SourceCodester Simple Company Website version 1.0. The vulnerability resides in the /classes/Login.php file, specifically in the handling of the 'Username' argument. Due to insufficient input sanitization or parameterized query usage, an attacker can manipulate the 'Username' parameter to inject malicious SQL code. This flaw allows remote attackers to execute arbitrary SQL commands on the backend database without requiring authentication or user interaction. The vulnerability has been publicly disclosed, increasing the risk of exploitation, although no known exploits are currently observed in the wild. The CVSS 4.0 score is 6.9, indicating a medium severity level, with attack vector being network-based, no privileges or user interaction required, and partial impact on confidentiality, integrity, and availability. The vulnerability could allow attackers to extract sensitive data, modify or delete records, or potentially escalate privileges within the application database, leading to data breaches or service disruption.

For European organizations using SourceCodester Simple Company Website 1.0, this vulnerability poses a significant risk to the confidentiality and integrity of their data. Exploitation could lead to unauthorized access to sensitive company information, customer data, or internal credentials stored in the database. This could result in data breaches subject to GDPR regulations, leading to legal and financial penalties. Additionally, attackers could alter or delete critical business data, disrupting operations and damaging organizational reputation. Since the vulnerability allows remote exploitation without authentication, attackers can target exposed web servers directly, increasing the attack surface. Organizations relying on this software for public-facing websites or internal portals could face operational downtime or reputational harm if exploited. The medium CVSS score suggests moderate impact, but the critical classification and public disclosure warrant urgent attention.

To mitigate this vulnerability, organizations should immediately review and update the affected SourceCodester Simple Company Website 1.0 installation. Since no official patch links are provided, administrators should implement the following specific measures: 1) Apply input validation and sanitization on the 'Username' parameter to prevent SQL injection, preferably using prepared statements or parameterized queries in the /classes/Login.php file. 2) Employ Web Application Firewalls (WAFs) configured to detect and block SQL injection patterns targeting login endpoints. 3) Conduct code audits and penetration testing focusing on authentication modules to identify and remediate similar injection flaws. 4) Restrict database user permissions to the minimum necessary to limit the impact of potential injection attacks. 5) Monitor logs for suspicious login attempts or unusual database queries indicative of exploitation attempts. 6) If feasible, upgrade to a newer, patched version of the software or consider alternative solutions with secure coding practices. 7) Educate development and IT teams about secure coding standards to prevent recurrence.