CVE-2026-54645 in CubeCart
Summary
by MITRE • 09/18/2026
CubeCart is an ecommerce software solution. Prior to 6.7.5, admin/sources/products.index.inc.php reads the description, description_short, and spec_copy rich-text fields from $GLOBALS['RAW']['POST'] and removes only script elements before the values are stored and rendered through Smarty templates. An administrator with product-editing rights can store event-handler attributes, SVG content, or javascript: URIs that bypass this filter, causing persistent JavaScript execution when a storefront visitor or another administrator views the product content and enabling session exposure or unauthorized browser-context actions. This issue is fixed in version 6.7.5.
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Analysis
by VulDB Data Team • 09/18/2026
CubeCart is a widely used open-source ecommerce platform designed to facilitate online retail operations through features such as inventory management, payment processing, and storefront customization. The vulnerability identified affects versions prior to 6.7.5, specifically within the administrative interface component responsible for managing product data. This module handles the ingestion of rich-text fields including description, short description, and specification copy, which are intended to allow administrators to format product information with basic styling and structure. However, the input validation mechanism implemented in admin/sources/products.index.inc.php is insufficiently robust against sophisticated cross-site scripting attacks. The system attempts to mitigate risks by stripping script elements from user-supplied data before storage; however, this filtering logic relies on a naive pattern matching approach that fails to account for alternative vector types capable of executing arbitrary JavaScript code within the context of the victim's browser session.
The technical flaw stems from an incomplete sanitization process where only explicit script tags are removed, leaving other executable constructs intact. An attacker with administrative privileges or sufficient product-editing rights can exploit this gap by injecting event-handler attributes such as onerror or onload into HTML elements like images or divs, embedding Scalable Vector Graphics SVG content that contains embedded JavaScript, or utilizing javascript: URIs within href attributes of anchor tags. These payloads bypass the existing filter because they do not contain the literal string script followed by a greater-than sign. When these maliciously crafted product descriptions are stored in the database and subsequently rendered through Smarty templates on either the public storefront or internal administrative pages, the browser interprets the injected code as part of the page's legitimate content. This results in persistent cross-site scripting because the payload is saved server-side and executed every time a user views the affected product listing.
The operational impact of this vulnerability extends beyond simple defacement or alert box displays. Since the script executes within the context of the authenticated session, an attacker can perform unauthorized actions on behalf of the victim administrator or storefront visitor. This includes stealing session cookies to hijack administrative accounts, exfiltrating sensitive customer data such as names and addresses stored in local storage or accessible via DOM manipulation, and performing state-changing requests like modifying product prices, deleting inventory items, or altering user permissions without authorization. The persistence of the payload means that every subsequent visit by any authenticated user triggers the malicious code, amplifying the potential damage across multiple sessions and users who interact with the compromised product pages. This represents a significant risk to data integrity and confidentiality within the ecommerce ecosystem.
Industry standards classify this vulnerability under CWE-79, which describes Improper Neutralization of Input During Web Page Generation commonly known as Cross-site Scripting. Specifically, it aligns with subcategories involving stored XSS where malicious scripts are permanently stored on target servers. In terms of offensive security frameworks such as MITRE ATT&CK, this behavior corresponds to techniques like T1059 Command and Scripting Interpreter for executing JavaScript within the browser environment and potentially T1534 Internal Spearphishing if used to trick administrators into clicking links that trigger further exploitation chains. The vulnerability highlights a common pitfall in web application development where developers assume that removing obvious dangerous tags is sufficient, neglecting the need for comprehensive output encoding or strict allow-list based validation of HTML content.
Mitigation strategies primarily involve upgrading CubeCart to version 6.7.5 or later, which addresses this issue by implementing more rigorous input sanitization and potentially adopting a whitelist approach for allowed HTML attributes and elements. For organizations unable to immediately patch their systems due to operational constraints, temporary mitigations include restricting administrative access through IP whitelisting to prevent unauthorized users from accessing the product editing interface. Additionally, deploying a Web Application Firewall with rules capable of detecting and blocking SVG-based XSS payloads or event handler injections can provide an additional layer of defense. It is also advisable to implement Content Security Policy headers that restrict script execution sources, although this may require careful configuration to avoid breaking legitimate functionality within the ecommerce platform. Regular security audits focusing on input validation logic for rich-text fields are recommended to prevent similar vulnerabilities in other modules or future versions of the software.