How Laravel's Blade Syntax Choice Can Either Block or Enable XSS Attacks

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Cross-Site Scripting (XSS) is a web attack where malicious JavaScript is injected into pages and executed in other users' browsers, potentially stealing session tokens or hijacking accounts. XSS comes in three forms: reflected (via URL parameters), stored (saved to a database and shown to all visitors), and DOM-based (occurring entirely in client-side JavaScript). In Laravel's Blade templating engine, using double curly braces {{ }} automatically HTML-encodes output, neutralising any injected scripts before they can run. By contrast, the raw output syntax {!! !!} renders content unescaped, making it dangerous when used with user-supplied or database-sourced data. Developers are advised to default to {{ }} and treat any use of {!! !!} with strong scrutiny, as the two-character difference is often what separates a secure app from a compromised one.

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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