CVE-2007-3627 in Calendar Express
Summary
by MITRE
Multiple SQL injection vulnerabilities in PHP Lite Calendar Express 2.2 allow remote attackers to execute arbitrary SQL commands via the cid parameter to (1) login.php, (2) auth.php, and (3) subscribe.php. NOTE: the month.php, year.php, week.php, and day.php vectors are already covered by CVE-2005-4009. NOTE: the provenance of this information is unknown; the details are obtained solely from third party information.
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Analysis
by VulDB Data Team • 11/09/2025
The vulnerability identified as CVE-2007-3627 represents a critical SQL injection flaw in PHP Lite Calendar Express version 2.2 that exposes multiple attack vectors through the cid parameter. This vulnerability falls under the category of CWE-89 SQL Injection, which is classified as a common weakness in web applications that fail to properly sanitize user input before incorporating it into database queries. The affected components include login.php, auth.php, and subscribe.php scripts, making these entry points particularly dangerous for attackers seeking unauthorized access to the calendar application's backend database system.
The technical exploitation of this vulnerability occurs when an attacker manipulates the cid parameter through HTTP requests to these specific PHP files. When the application processes this parameter without proper input validation or sanitization, malicious SQL code can be injected into the database query execution flow. This allows attackers to execute arbitrary SQL commands on the underlying database, potentially leading to complete database compromise, data exfiltration, or unauthorized modification of calendar entries and user accounts. The attack vector operates entirely through web-based HTTP requests, making it accessible to remote threat actors without requiring local system access.
The operational impact of this vulnerability extends beyond simple data theft, as successful exploitation could enable attackers to escalate privileges within the calendar application, modify user authentication credentials, or even gain administrative control over the entire calendar system. The fact that multiple files are affected increases the attack surface and provides attackers with several potential entry points to achieve their objectives. This vulnerability particularly affects organizations using PHP Lite Calendar Express 2.2 in production environments where calendar data may contain sensitive information, making it a prime target for attackers seeking to compromise organizational data assets.
Security professionals should implement multiple layers of defense to mitigate this vulnerability, including input validation at the application level, parameterized queries to prevent SQL injection, and regular security assessments of web applications. The remediation approach should focus on validating and sanitizing all user-supplied input, particularly parameters like cid that are directly incorporated into database queries. Organizations should also consider implementing web application firewalls and database activity monitoring solutions to detect and prevent exploitation attempts. Additionally, this vulnerability aligns with ATT&CK technique T1190 for exploitation of remote services and T1071.004 for application layer protocol usage, demonstrating how such vulnerabilities can be leveraged in broader attack campaigns targeting web applications and database systems.