CVE-2010-4794 in Com Jscalendar
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in the JoomlaSeller JS Calendar (com_jscalendar) component 1.5.1 and 1.5.4 for Joomla! allow remote attackers to inject arbitrary web script or HTML via the (1) month and (2) year parameters in a jscalendar action to index.php. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 08/12/2025
The vulnerability CVE-2010-4794 represents a critical cross-site scripting flaw within the JoomlaSeller JS Calendar component version 1.5.1 and 1.5.4 for Joomla component is particularly concerning as it represents a widely used calendar functionality that could be leveraged to compromise user sessions and execute unauthorized actions on behalf of victims.
The technical exploitation of this vulnerability occurs when remote attackers craft malicious payloads containing script code within the month and year parameters of the jscalendar action. When these parameters are processed without proper input validation or output encoding, the injected scripts become executable within the context of other users' browsers who view the affected calendar pages. This type of vulnerability demonstrates a classic lack of proper sanitization controls in web applications, where user input flows directly into the application's response without adequate filtering or encoding. The attack vector is particularly dangerous because it requires no special privileges or authentication, making it accessible to any remote attacker who can influence the calendar component's input parameters.
The operational impact of CVE-2010-4794 extends beyond simple script injection, as it can enable attackers to perform session hijacking, deface websites, redirect users to malicious domains, or harvest sensitive information from authenticated sessions. When combined with other attack techniques, this vulnerability could facilitate more sophisticated attacks such as credential theft or privilege escalation within the Joomla component versions means that numerous websites using the platform could be simultaneously exposed to these attacks, creating a significant risk for organizations relying on the affected calendar functionality. The attack can be particularly insidious because it leverages legitimate application features to deliver malicious content, making detection more difficult for security monitoring systems.
Organizations should implement immediate mitigations including input validation, output encoding, and parameter sanitization to address this vulnerability. The recommended approach involves implementing proper input filtering that validates and sanitizes all user-supplied parameters, particularly those used in dynamic content generation. Security patches or updates from the Joomla! community and component developers should be applied immediately to resolve the vulnerability. Additional protective measures include implementing web application firewalls, establishing proper content security policies, and conducting regular security assessments to identify similar vulnerabilities in other components. The ATT&CK framework categorizes this vulnerability under T1190 - Exploit Public-Facing Application, highlighting the importance of proper input validation and the need for comprehensive application security testing. Organizations should also consider implementing automated scanning tools to detect similar vulnerabilities across their web applications and establish incident response procedures to address potential exploitation attempts.