Content Injection due to quoteless attributes Affecting mustache Open this link in a new tab package, versions [,2.2.1)

  • Attack Complexity


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  • snyk-id


  • published

    14 Dec 2015

  • disclosed

    14 Dec 2015

  • credit

    Matias P. Brutti

Introduced: 14 Dec 2015

CWE-79 Open this link in a new tab


When using attributes without quotes in a mustache template, an attacker can manipulate the input to introduce additional attributes, potentially executing code. This may lead to a Cross-site Scripting (XSS) vulnerability, assuming an attacker can influence the value entered into the template. If the mustache template is used to render user-generated content, this vulnerability may escalate to a persistent XSS vulnerability.


For example, assume mustache was used to display user comments, using the following template: <a href={{email}}>{{name}}</a><pre>{{comment}}</pre>

If an attacker spoofed his email address and provided the following value: onload=alert(document.cookie)

The resulting HTML would be: <a onload=alert(document.cookie)>Evil Wizard</a><pre>Busted!</pre>