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It may seem obvious, but ensuring you keep all software up to date is vital in keeping your site secure.
This applies to both the server operating system and any software you may be running on your website such as a CMS or forum.
These can however be bypassed, and you should make sure you check for these validation and deeper validation server side as failing to do so could lead to malicious code or scripting code being inserted into the database or could cause undesirable results in your website.
Everyone knows they should use complex passwords, but that doesn’t mean they always do.
This is a particular concern in modern web applications, where pages are now built primarily from user content, and which in many cases generate HTML that's then also interpreted by front-end frameworks like Angular and Ember.
This makes it harder for an attacker's scripts to work, even if they can get them into your page.
Be careful with how much information you give away in your error messages.
use Attribute and Content, which will be automatically escaped by the browser, rather than setting element.inner HTML by hand), or use functions in your templating tool that automatically do appropriate escaping, rather than concatenating strings or setting raw HTML content.
Another powerful tool in the XSS defender's toolbox is Content Security Policy (CSP).Consider this query: Since '1' is equal to '1' this will allow the attacker to add an additional query to the end of the SQL statement which will also be executed.