CVE-2026-103849 in Commerce B2B
Summary
by MITRE • 10/13/2026
Adobe Commerce is affected by an Improper Neutralization of Special Elements Used in a Template Engine vulnerability that could result in arbitrary code execution in the context of the current user, potentially gaining elevated access or control over the victim's account or session. Exploitation of this issue does not require user interaction. Scope is changed.
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Analysis
by VulDB Data Team • 10/13/2026
The identified security flaw within Adobe Commerce represents a critical server-side template injection vulnerability classified under CWE-94 as Improper Neutralization of Special Elements Used in a Code Block, specifically involving the use of dynamic content within templating engines. This architectural weakness stems from insufficient validation and sanitization processes applied to user-supplied input before it is processed by the application's rendering engine. In modern e-commerce platforms like Adobe Commerce, template engines are responsible for dynamically generating HTML output based on data retrieved from databases or received via HTTP requests. When these engines execute code snippets embedded within templates without proper isolation or escaping mechanisms, an attacker can inject malicious script fragments that bypass standard security controls. The core technical failure lies in the application's inability to distinguish between legitimate template directives and executable code payloads introduced by external actors, allowing arbitrary commands to be interpreted as part of the server-side logic rather than static content.
The operational impact of this vulnerability is severe due to its potential for remote code execution without any prerequisite user interaction. Unlike cross-site scripting attacks that often require a victim to click on a malicious link or view specific content, this flaw can potentially be triggered through automated requests sent directly to the application's endpoints. If an attacker successfully exploits this template injection vector, they achieve arbitrary code execution within the context of the web server process running Adobe Commerce. This effectively grants the attacker full control over the underlying system environment associated with that user session or service account. The consequences include complete compromise of confidential customer data such as payment card information and personal identifiable information stored in the database, manipulation of product listings and pricing structures to facilitate fraud, and potential use of the compromised server as a pivot point for further attacks against internal network infrastructure.
From an offensive security perspective, this vulnerability aligns with MITRE ATT&CK techniques related to Server-Side Request Forgery or Command Injection depending on how the template engine is leveraged to execute system commands. Attackers may utilize automated scanning tools to probe various input fields and URL parameters for signs of template execution errors or unexpected output patterns that indicate successful injection. The lack of required user interaction significantly lowers the barrier to entry for exploitation, making this a high-priority target for opportunistic attackers seeking quick access to valuable e-commerce environments. Once initial foothold is gained through code execution, adversaries can escalate privileges by exploiting local system vulnerabilities or misconfigured service accounts associated with the web application process, thereby achieving persistent control over the merchant's digital storefront and backend systems.
Mitigation strategies must focus on immediate remediation of the underlying template engine configuration and input validation logic. Adobe has likely released a security patch addressing this specific CVE that updates the core framework to enforce stricter separation between data and code within templates. Administrators should apply these patches immediately in production environments while ensuring compatibility with existing custom modules and extensions, as third-party plugins may also contain similar vulnerabilities if they rely on unsafe template practices. In addition to applying vendor-supplied fixes, organizations should implement Web Application Firewalls configured with rulesets capable of detecting common template injection patterns such as double curly braces or specific function calls often used in popular templating languages like Twig or Smarty. Input validation must be strengthened by whitelisting allowed characters and rejecting any input containing special symbols that could alter the structure of the executed code. Furthermore, adopting a principle of least privilege for database connections and file system access within the application context can limit the blast radius if an exploitation attempt succeeds, reducing the potential damage to critical business operations and sensitive data assets.