Google Chrome 146 Introduces DBSC to Stop Cookie Theft Attacks

Google is quietly rolling out one of its most important browser security upgrades in years and it directly targets one of the most common ways hackers take over accounts.

With the latest Chrome update, the company is expanding support for Device Bound Session Credentials (DBSC), a new system designed to stop attackers from hijacking accounts using stolen cookies.

If that sounds technical, the problem it solves isn’t.

Today, most websites keep users logged in using session cookies, small bits of data stored in the browser. If attackers steal those cookies, they can log into accounts without needing passwords or even two-factor authentication.

That’s exactly what DBSC is trying to break.

Instead of treating cookies as standalone login tokens, Chrome now ties sessions to the physical device itself using cryptographic keys stored securely on the machine. 

In practical terms, even if a hacker manages to steal your session cookie, it won’t work anywhere else because they won’t have access to the device-specific key needed to prove identity.

That’s a major shift in how web authentication works.

Under the hood, DBSC replaces long-lived session cookies with short-lived ones that must be continuously refreshed. During that refresh process, Chrome proves that the request is coming from the original device by signing a cryptographic challenge.

It’s a subtle change for users but a nightmare for attackers.

Cookie theft has become one of the fastest-growing cyberattack methods in recent years, especially through malware that quietly extracts browser data. Once stolen, these cookies can be sold or reused to access everything from email accounts to corporate systems.

Google’s move effectively cuts off that pathway.

And it’s not just about consumers.

The feature is also aimed at enterprises, where session hijacking has become a serious threat vector. By binding sessions to hardware-backed keys often stored in secure modules like TPM chips, DBSC makes it significantly harder for attackers to reuse stolen credentials at scale. 

Still, there are limitations.

DBSC doesn’t stop attacks that already have full control of a device. If malware is actively running on your machine, it can still interact with your session locally. But what it does prevent is something far more common, attackers taking stolen credentials and using them remotely.

And that alone is a big deal.

Because in today’s threat landscape, stealing cookies has become easier than cracking passwords.

What Google is doing with Chrome 146 is essentially redefining what it means to be “logged in” — shifting from something you have (a cookie) to something tied to where you are (your device).

It’s a quiet change.

But it could fundamentally reshape how the web defends itself against one of its oldest security problems.