CVE-2012-1835 in All-in-One Event Calendar
Summary
by MITRE
Multiple cross-site scripting (XSS) vulnerabilities in the All-in-One Event Calendar plugin 1.4 and 1.5 for WordPress allow remote attackers to inject arbitrary web script or HTML via the (1) title parameter to app/view/agenda-widget-form.php; (2) args, (3) title, (4) before_title, or (5) after_title parameter to app/view/agenda-widget.php; (6) button_value parameter to app/view/box_publish_button.php; or (7) msg parameter to /app/view/save_successful.php.
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Analysis
by VulDB Data Team • 06/07/2025
The CVE-2012-1835 vulnerability represents a critical cross-site scripting flaw in the All-in-One Event Calendar plugin version 1.4 and 1.5 for WordPress systems. This vulnerability stems from inadequate input validation and sanitization mechanisms within the plugin's core components, specifically affecting multiple file paths that handle user-supplied data through various HTTP parameters. The vulnerability is classified under CWE-79 as a failure to sanitize input data, making it susceptible to malicious code injection attacks that can compromise user sessions and execute unauthorized commands on behalf of victims.
The technical exploitation of this vulnerability occurs through multiple attack vectors within the plugin's view files. Attackers can inject malicious scripts through the title parameter in agenda-widget-form.php, or through several parameters including args, title, before_title, and after_title in agenda-widget.php, as well as button_value in box_publish_button.php and msg in save_successful.php. These parameters are processed without proper HTML escaping or sanitization, allowing attackers to inject malicious JavaScript code that gets executed when other users view the affected pages. The vulnerability essentially permits an attacker to hijack user sessions, steal cookies, or redirect users to malicious websites through the execution of crafted payloads.
The operational impact of CVE-2012-1835 extends beyond simple script injection, as it can lead to complete compromise of WordPress installations when attackers leverage the vulnerability to gain persistent access to user accounts. Since WordPress is widely used for content management and often contains sensitive information, this vulnerability can result in data breaches, unauthorized content modification, or the establishment of backdoors. The attack surface is particularly concerning because the affected parameters are commonly used in widget configurations and event display functionalities that are frequently accessed by both administrators and regular users, making successful exploitation likely in environments with active user interaction.
Mitigation strategies for this vulnerability should include immediate plugin updates to versions that properly sanitize all user inputs and implement proper HTML escaping mechanisms. Organizations should also implement content security policies to prevent execution of unauthorized scripts, conduct regular security audits of installed plugins, and apply the principle of least privilege when configuring WordPress environments. The vulnerability aligns with ATT&CK technique T1566.001 for initial access through web application attacks, and T1059.007 for command and scripting interpreter usage. Security teams should monitor for exploitation attempts through web application firewalls and implement proper input validation at multiple layers of the application architecture to prevent similar vulnerabilities from being introduced in future developments.