Chrome may soon get an important extra layer of defense against so-called New Tab hijackers and extensions that take over the default search engine. The news centers on one specific problem: implicit trust in browser policy stored locally on your device. In so-called “low-trust” environments, that policy can be abused without you granting permission.
Google is preparing a security feature that blocks attempts to install policy extensions that change exactly these browser settings. The measure is not live yet in the stable version, but the direction is clear: less room for malware to hide behind policy mechanisms.
Why “implicit trust” is risky
Today, Chrome can allow organizations to force enterprise policy extensions and push browser settings. On well-managed work PCs—for example with domain management or through a device management system—this is usually fine. After all, the administrator uses a controlled chain.
But on consumer PCs, things look different. If Chrome reads local policy keys without validating them against a trusted authority, you get a scenario in which it looks like something was configured by an administrator, even when it wasn’t. Google describes this as low-trust: the browser “leans” on locally stored policy information without confirmation from a trusted source.
How New Tab hijackers can get stuck
According to Google, malicious software can add local Chrome policy values without the user’s consent. Next, that software can force an extension that replaces the New Tab page or reroutes search queries to suspicious destinations.
The annoying part is that Chrome may assume the extension was installed by a real administrator. As a result, it often becomes hard to simply disable or remove the extension. Sometimes you’ll also see the confusing message “Managed by your organization”, even though your computer is not actually managed by an organization.
In other words: the attacker uses a legitimate policy mechanism to achieve an illegitimate goal. That’s exactly what implicit trust means: the browser treats local policy as if it can be trusted.
What Google will block (and when)
Google wants to block policy-installed extensions on unmanaged Windows and macOS devices as soon as they try to override the New Tab page or the default search engine. In the proposed approach, the installation isn’t carried out. Chrome then stores the extension ID as blocked-extension, so it won’t be retried later based on the same policy check.
In addition, Chrome stops attempting to download the same blocked extension again during future policy comparisons. This should reduce repeated install attempts and unnecessary network traffic.
Not only blocking—also preventing it from sticking
A second trick used by malware is also being addressed: an extension you installed manually should no longer be automatically “converted” into a locked, policy-driven extension. If you control your own extensions, you can still disable or remove them.
Even if a device was marked as managed at some point but later loses its trusted management status—while local policy keys remain—Chrome could automatically remove relevant New Tab and search override extensions.
Escape hatch for legitimate administrators
Google takes into account that some enterprise scenarios do require an extension to replace the New Tab page or search engine. That’s why, according to the description, an escape-hatch policy will be added that allows administrators to turn off the protection when it’s needed.
This is how Google tries to keep the balance: more protection for consumers and unmanaged devices, without fully frustrating legitimate business installations.
What’s the status of this security change?
The changes BleepingComputer observed are listed in a series of Chromium Gerrit updates. The feature is still not available in stable Chrome. Google is working on it, but the feature flag appears to still be under review.
In the source context, Google indicated that the protection is intended to be activated once the required approval is in place. Until then, it remains important that users and security teams don’t only trust “browser behavior,” but also monitor policy on endpoints properly.
Test your detection: prevent attacks from going unnoticed
Security research often shows that attacks become visible only once they’ve already had an effect. Google reinforces that idea with a broader thought: teams log part of the successful attacks, but a significant portion goes through without enough signaling.
That’s why it’s worth testing your defenses before attackers do. Not only on endpoints, but also on the signals your SIEM and EDR need to pick up—for example, when extensions are forced via policy keys or when browser settings suddenly change.
If you want to read more about how to make this kind of detection and governance concrete, you can also check the piece on what you do now after a hack or patch. That article helps translate technical events into practical follow-up actions.
What you can do now as an organization or user
Even if the new Chrome block is likely to arrive one step later, you can already take measures that reduce the chance of abuse.
- Check policy traces on endpoints: watch for local policy keys and unusual changes that don’t fit your management process.
- Monitor extension behavior: when the New Tab page or search engine changes, treat it as a security signal—not “just a browser thing.”
- Limit unmanaged devices: wherever possible, move toward managed devices via MDM/domain management.
- Respond to the “Managed by your organization” symptom: especially when the device is not actually managed.
By taking these signals seriously, you reduce the impact of implicit trust in policy mechanisms—and increase the likelihood that you intervene earlier than the attacker.
More context: browser redirection and policy abuse
Browser hijacking often goes hand in hand with redirecting users to suspicious websites and manipulating user behavior. In earlier reporting, there has been attention on deception aimed at digital environments. Consider topics like implicit trust in 4G/5G cores, where policy/trust chains can also be abused. You see these kinds of patterns—trust in the wrong place—across multiple attack routes.
The Chrome approach fits into that same mindset: less trust where there’s no real trusted authority behind it, and a clear block when browser settings get hijacked.
Conclusion
Google is preparing a Chrome protection that blocks policy extensions on unmanaged devices as soon as they take over the New Tab page or the default search engine. That slows down implicit trust in locally stored policy information—the same mechanism malware can use to “stick” extensions and make removal harder.
Although the feature is not yet available in stable Chrome, the message is already relevant: treat unauthorized policy changes and unexpected browser settings as potential security incidents. This helps you fall less behind when attackers use the policy mechanism as camouflage.
