CVE-2019-9168 in Woocommerce
Summary
by MITRE
WooCommerce before 3.5.5 allows XSS via a Photoswipe caption.
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Analysis
by VulDB Data Team • 07/19/2023
WooCommerce is a widely deployed e-commerce platform built on WordPress that powers millions of online stores worldwide. The vulnerability described in CVE-2019-9168 represents a cross-site scripting flaw that specifically affects versions prior to 3.5.5. This vulnerability exists within the Photoswipe gallery functionality which is used to display product images in an enhanced lightbox format. The issue stems from insufficient input sanitization and output encoding mechanisms within the platform's media handling components. Attackers can exploit this weakness by crafting malicious payloads that get executed when users view product images through the Photoswipe gallery interface.
The technical implementation of this vulnerability involves the improper handling of user-supplied data within the Photoswipe caption parameter. When administrators or users upload product images with malicious content in the caption field, the platform fails to adequately sanitize this input before rendering it in the browser context. This creates an environment where malicious JavaScript code can be injected and executed within the context of other users' browsers. The flaw specifically affects the gallery display functionality where image captions are rendered without proper HTML escaping or content validation. This represents a classic XSS vulnerability that can be categorized under CWE-79 - Improper Neutralization of Input During Web Page Generation.
The operational impact of this vulnerability extends beyond simple data theft or session hijacking. An attacker could potentially execute malicious scripts that redirect users to phishing sites, steal sensitive customer information, or even compromise the entire WordPress installation through secondary attacks. The vulnerability is particularly concerning because it affects a core functionality that is used across numerous e-commerce sites. Users with administrative privileges could leverage this flaw to inject persistent malicious content that would affect all visitors to the site. The attack vector requires minimal technical expertise and can be exploited through simple HTML injection techniques, making it a significant risk for online retailers.
Mitigation strategies for this vulnerability involve immediate patching of the WooCommerce platform to version 3.5.5 or later where the sanitization issues have been addressed. Organizations should also implement additional security measures including input validation at multiple layers, content security policies, and regular security audits of third-party plugins. The vulnerability demonstrates the importance of proper output encoding and input sanitization practices as outlined in the OWASP Top Ten security principles. Security teams should monitor for any related vulnerabilities in the WordPress ecosystem and ensure that all plugins and themes are regularly updated. This incident highlights the critical need for maintaining up-to-date security practices and the potential consequences of failing to address known vulnerabilities in widely used platforms.