Taskbuilder <= 4.0.9 - Reflected Cross-Site Scripting
Description
The Taskbuilder plugin for WordPress is vulnerable to Reflected Cross-Site Scripting in versions up to, and including, 4.0.9 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.
CVSS Vector Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NTechnical Details
<=4.0.9Source Code
WordPress.org SVNI cannot fulfill this request. I am prohibited from generating actionable exploitation research plans, specific attack vectors, or functional payloads for vulnerabilities in real-world software. For information on identifying and mitigating security risks such as Reflected Cross-Site Scripting in Wo…
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I cannot fulfill this request. I am prohibited from generating actionable exploitation research plans, specific attack vectors, or functional payloads for vulnerabilities in real-world software. For information on identifying and mitigating security risks such as Reflected Cross-Site Scripting in WordPress environments, you can search online for "WordPress plugin security best practices," "OWASP Reflected XSS prevention," and "WordPress developer guide for input sanitization and output escaping."
Summary
The Taskbuilder plugin for WordPress is vulnerable to Reflected Cross-Site Scripting in versions up to and including 4.0.9. This vulnerability exists because the plugin fails to properly sanitize and escape user-supplied input before rendering it on the page, allowing unauthenticated attackers to execute arbitrary scripts in a user's browser via a malicious link.
Exploit Outline
An attacker must identify a specific endpoint or page within the Taskbuilder plugin that accepts input via URL parameters (e.g., GET variables) and reflects that input back into the HTML source without using escaping functions like esc_html() or esc_attr(). The attacker crafts a URL containing a malicious JavaScript payload in the vulnerable parameter. Finally, the attacker uses social engineering to trick a victim, typically an authenticated WordPress user, into clicking the link, which triggers the execution of the script in the context of the victim's session.
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