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Miggo AIRoot Cause AnalysisThe vulnerability, CVE-2026-75650 (StyleSmuggler), is described as an 'Improper Neutralization of Special Elements Used in a Template Engine' in Adobe Commerce, leading to arbitrary code execution. Analysis of the Sansec report indicates that attackers inject malicious PHP code into Magento's template system, specifically leveraging 'styles' properties to bypass existing safeguards. This injected code is then executed when Magento renders a template, with 'failed payment emails' being a confirmed trigger.
Without direct access to the patch file (VULN-39341-composer-patches.zip), the identification of vulnerable functions relies on inferring from the detailed description of the attack vector and Magento's architecture. The two functions identified, Magento\Email\Model\Template::getProcessedTemplate and Magento\Framework\View\TemplateEngine\Php::render, are central to email template processing and the underlying PHP template rendering, respectively.
getProcessedTemplate is implicated because it's responsible for combining template content with dynamic data, including potentially malicious 'styles' properties, before rendering. If sanitization is insufficient at this stage, the malicious input proceeds. render is the ultimate execution point for PHP code within templates. Therefore, during an exploitation, the malicious payload would flow through getProcessedTemplate (or a similar email template processing function) and eventually be executed by render within the template engine. The confidence is low due to the absence of the actual patch to confirm the exact lines of code modified, but these functions represent the most probable points of failure based on the vulnerability description.
Magento\Email\Model\Template::getProcessedTemplateapp/code/Magento/Email/Model/Template.php
Magento\Framework\View\TemplateEngine\Php::renderlib/internal/Magento/Framework/View/TemplateEngine/Php.php