CVE-2006-5977 in MultiCalendars
Summary
by MITRE
Multiple SQL injection vulnerabilities in MultiCalendars allow remote attackers to execute arbitrary SQL commands via the (1) M or (2) Y parameter to rss_out.asp, or the (3) cate parameter to all_calendars.asp. NOTE: the all_calendars.asp/calsids vector is already covered by CVE-2006-2293.
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Analysis
by VulDB Data Team • 04/27/2026
The vulnerability described in CVE-2006-5977 represents a critical SQL injection flaw within the MultiCalendars web application that exposes multiple attack vectors for remote exploitation. This vulnerability specifically targets the rss_out.asp and all_calendars.asp scripts, where user input is improperly sanitized before being incorporated into database queries. The affected parameters M, Y, and cate serve as primary entry points for malicious actors to inject arbitrary SQL commands into the backend database system, potentially leading to complete system compromise and unauthorized data access.
The technical implementation of this vulnerability stems from inadequate input validation and parameter sanitization within the MultiCalendars application code. When the M and Y parameters are passed to rss_out.asp or the cate parameter to all_calendars.asp, the application directly concatenates these values into SQL query strings without proper escaping or parameterization. This flaw aligns with CWE-89 which specifically addresses SQL injection vulnerabilities where untrusted data is incorporated into SQL commands without adequate sanitization. The vulnerability demonstrates a classic example of insufficient input filtering that allows attackers to manipulate database queries through crafted malicious input strings.
The operational impact of this vulnerability extends far beyond simple data theft, as successful exploitation can enable attackers to execute arbitrary commands on the underlying database server. Remote attackers can leverage this vulnerability to extract sensitive information, modify database contents, delete critical records, or even escalate privileges within the database environment. The implications are particularly severe given that the vulnerability affects calendar management functionality, which may contain sensitive organizational data including event details, user information, and potentially confidential scheduling data. This represents a significant risk to organizational security and data integrity.
Mitigation strategies for CVE-2006-5977 should focus on implementing proper input validation and parameterized queries throughout the MultiCalendars application. The recommended approach involves sanitizing all user inputs through proper escaping mechanisms and implementing prepared statements or parameterized queries to prevent SQL injection attacks. Organizations should also consider applying the vendor-supplied patches or updates that address this specific vulnerability. Additionally, network-level protections such as web application firewalls and intrusion detection systems can provide additional layers of defense against exploitation attempts. The vulnerability's classification under ATT&CK technique T1190 highlights the importance of implementing proper input validation as a foundational security control to prevent this type of attack vector. Regular security assessments and code reviews should be conducted to identify similar vulnerabilities in other application components and ensure comprehensive protection against SQL injection threats.