CVE-2010-0637 in WebCalendar
Summary
by MITRE
Multiple cross-site request forgery (CSRF) vulnerabilities in WebCalendar 1.2.0, and other versions before 1.2.5, allow remote attackers to hijack the authentication of administrators for requests that (1) delete an event or (2) ban an IP address from posting via unknown vectors. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 04/30/2026
The CVE-2010-0637 vulnerability represents a critical cross-site request forgery weakness affecting WebCalendar versions prior to 1.2.5, specifically targeting administrative functions within the application. This vulnerability stems from the application's failure to implement proper anti-CSRF mechanisms for sensitive administrative operations, creating a significant security risk for organizations relying on this calendar system. The flaw allows remote attackers to exploit the trust relationship between authenticated administrators and the web application, enabling unauthorized actions that could compromise system integrity and availability. The vulnerability specifically impacts two critical administrative functions: event deletion and IP address banning, both of which can be executed without proper authentication verification from the legitimate administrator.
The technical implementation of this CSRF vulnerability occurs through the absence of anti-CSRF tokens or similar protective mechanisms in the affected administrative endpoints. When administrators perform administrative tasks, the application should validate that requests originate from legitimate sources and contain proper authentication tokens to prevent unauthorized execution of administrative commands. However, WebCalendar 1.2.0 and earlier versions fail to enforce these security controls, allowing attackers to craft malicious requests that appear to come from authenticated administrators. The vulnerability operates through unknown vectors that likely involve manipulating HTTP request parameters or leveraging session management weaknesses that do not properly validate the authenticity of administrative operations.
The operational impact of this vulnerability extends beyond simple data manipulation, as it enables attackers to completely compromise administrative functions within the calendar system. An attacker could delete critical events without authorization, potentially disrupting organizational scheduling and communication workflows. Additionally, the ability to ban IP addresses from posting creates a potential for denial-of-service attacks against legitimate users or systems, effectively locking out authorized participants from accessing the calendar application. This vulnerability directly violates security principles outlined in the OWASP Top Ten, specifically addressing the lack of proper input validation and authentication controls that should prevent unauthorized administrative actions. The impact is particularly severe because administrators often have elevated privileges within web applications, making this vulnerability a prime target for attackers seeking to gain persistent control over systems.
Mitigation strategies for CVE-2010-0637 should focus on implementing proper anti-CSRF protections, including the deployment of unique tokens for each administrative request and validation of these tokens upon submission. Organizations should upgrade to WebCalendar version 1.2.5 or later, which includes the necessary security patches to address these vulnerabilities. The solution aligns with CWE-352, which specifically addresses cross-site request forgery vulnerabilities, and follows ATT&CK techniques related to privilege escalation and credential access. Additional defensive measures include implementing proper session management controls, enforcing strict input validation on administrative endpoints, and establishing monitoring for suspicious administrative activities. Network-level protections such as web application firewalls can also help detect and prevent exploitation attempts, though the primary remediation involves addressing the root cause through proper CSRF token implementation and application code review.