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Application & OT Security · Intermediate

Auto-Escaping Template

A templating engine feature that automatically output-encodes variables for their context unless explicitly marked safe.

Definition

Modern frameworks such as React, Angular, Jinja2 and Razor escape output by default, eliminating most reflected and stored XSS. Vulnerabilities usually appear when developers bypass escaping with features like dangerouslySetInnerHTML, |safe or Html.Raw.

Example

A Jinja2 template escapes {{ comment }} automatically, but {{ comment|safe }} disables protection.

Exam tip

Bypassing auto-escaping APIs is a code review red flag.

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