Magento 2 XSS: Secure your Magento2 store from XSS

Updated 20 October 2023

Previously in this series of Magento 2 security, we discussed Magento2 SQL injection and learned how we can secure our store. Let’s discuss the XSS attack and check how we can secure our Magento 2 store from XSS.

Cross-site scripting or XSS is a web-based application vulnerability that occurs when an attacker is able to execute malicious script/code/style in the victim’s browser through client-side languages.

Any source of data can play the role of injection vector like environment variables, and input parameters.

Types of XSS vulnerabilities:

  1. Reflected: when a user clicks on the malicious link, the code gets delivered to the vulnerable website, and gets reflected back into the user’s browser.
  2. Stored: Malicious code is inserted into the application by the attacker and whenever the user visits the site or links, the attack gets executed.
  3. DOM-based: This attack does not need to interact with the web server, the attacker forces the user’s browser to execute code by modifying the DOM environment.
A successful magento2 XSS attack can:
  • Hijack user session
  • Steal cookies
  • expose sensitive information
  • escalating privileges or can deliver malware

How to secure your magento2 store against XSS

Check out this Webkul security module for a quick fix and audit your Magento 2 store to prevent XSS. Let’s discuss some global techniques:

1. Sanitize data input: Ensure that all the data is filtered and validated at both ends (server and client) before reflecting back to the user. Such as values of search parameters, and user details.

Filter out, and convert special characters like <, >, /, ?, & to their HTML or URL encoded values.

2. Implement Security Headers: Consider implementing x-xss-protection header it will block pages from loading when they detect a potential xss attack.

X-XSS-Protection: 1; mode=block

We can also implement a Content Security Policy header, this header mitigates XSS attacks by blocking unsafe scripts injected by attackers.

Or consider using the Strict-Transport-Security header it will only allow the execution of scripts from known, valid resources that are trusted by the application.

Conclusion

Although it’s not possible for every store owner to check against SQL vulnerabilities in their store, in such conditions Webkul can help in the detection and in mitigation of vulnerabilities in the Magento 2 store through its basic security module which can also be customized.

To safeguard your Magento 2 store from other attacks like malicious file upload or brute force visit our store and check out our Security Extension Suite for Magento 2 module for more details, which is effective in blocking malicious users and in notifying admins for suspected login attempts.

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  • Jhonny Parsi
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