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Request Smuggling: A Growing Threat to AppSec Leadership

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PSPortSwigger Blog
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Basically, request smuggling is a sneaky way hackers trick web servers to gain access to sensitive data.

Quick Summary

At Black Hat USA and DEFCON 2025, experts warned that request smuggling is evolving. This growing threat could expose your sensitive data. Organizations must act now to enhance their web security measures.

What Happened

At the recent Black Hat USA and DEFCON 2025 conferences, James Kettle, Director of Research at PortSwigger, delivered a compelling message about the state of web security. He warned that request smuggling?, a technique used by hackers to manipulate web requests, is not disappearing; instead, it is evolving and becoming more sophisticated. This alarming trend poses significant risks to application security (AppSec?) teams and the organizations they protect.

Kettle explained that despite years of efforts to defend against request smuggling? attacks, they continue to thrive. These attacks exploit the way web servers process requests, allowing attackers to sneak malicious requests past security measures. As web technologies evolve, so do the tactics used by cybercriminals, making it crucial for security professionals to stay ahead of the curve.

Why Should You Care

You might be wondering how this affects you. If you use the internet for anything — shopping, banking, or even just browsing — you are at risk. Request smuggling can lead to data breaches, exposing your personal information and financial details. Imagine a thief sneaking into a store through a back door while everyone is distracted at the front; that’s what request smuggling? does to web applications.

For businesses, the stakes are even higher. A successful request smuggling? attack could lead to significant financial losses, reputational damage, and legal consequences. If your company relies on web applications, you need to be aware of this evolving threat and take action to protect your assets.

The key takeaway is simple: stay informed and proactive about web security. Ignoring these threats could leave you vulnerable to attacks that could have devastating consequences.

What's Being Done

In response to this growing threat, security experts, including Kettle, are calling for a renewed focus on application security practices. Organizations are encouraged to adopt a multi-layered security approach that includes regular security assessments, code reviews, and employee training. Here are some immediate actions you can take:

  • Implement Web Application Firewalls (WAFs) to help filter out malicious requests.
  • Regularly review and update your application code to patch vulnerabilities?.
  • Educate your team about the latest security threats and best practices.

Experts are closely monitoring the evolution of request smuggling? techniques and their impact on web security. As the landscape changes, staying informed and adapting your security strategies will be essential to fend off these attacks.

💡 Tap dotted terms for explanations

🔒 Pro insight: The resurgence of request smuggling highlights the need for continuous adaptation in AppSec strategies to counteract evolving attack vectors.

Original article from

PortSwigger Blog

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