In Nunjucks versions prior to version 3.2.4, it was possible to bypass the restrictions which are provided by the autoescape functionality. If there are two user-controlled parameters on the same line used in the views, it was possible to inject cross site scripting payloads using the backslash \ character.
Nunjucks is a full featured templating engine for JavaScript. Versions 2.4.2 and lower have a cross site scripting (XSS) vulnerability in autoescape mode. In autoescape mode, all template vars should automatically be escaped. By using an array for the keys, such as name[]=<script>alert(1)</script>, it is possible to bypass autoescaping and inject content into the DOM.
Nunjucks has a cross site scripting (XSS) vulnerability in autoescape mode: all template vars should automatically be escaped. By using an array for the keys, it is possible to bypass autoescaping and inject content into the DOM.