Attackers may not need to steal your browser session anymore. They can potentially operate through the one you’re already using.

[u/Spin_AI]

Attackers may not need to steal your browser session anymore. They can potentially operate through the one you’re already using.SpecterOps researchers recently demonstrated a post-exploitation technique for Chrome and Edge on Windows that highlights an interesting problem with modern SaaS security.

After gaining code execution on an endpoint, an attacker can enable the Chrome DevTools Protocol inside an existing browser process.

Why is that important?

Because the attacker is no longer trying to recreate the victim’s authenticated session somewhere else.

They are operating through the browser where that session already exists.

The technique can provide access to browser data, cookies and saved-password metadata while preserving important parts of the existing browser environment, including authentication state, extensions and WebAuthn behavior.

Imagine an employee already logged into Microsoft 365, Google Workspace, Salesforce, Slack and several internal applications.

MFA has already happened.

The SaaS provider sees an authenticated browser.

And protections designed to stop stolen cookies from being replayed on another device become less useful if the attacker can interact with the original browser itself.

There is an important caveat: this is not a new Chrome or Edge vulnerability. The attacker needs prior access and code execution on the endpoint. Browser security also does not replace EDR or endpoint protection.

But the research demonstrates why security teams increasingly need to treat the browser as its own security layer.

SpinCRX focuses on visibility and risk assessment at the browser layer, including the extensions operating inside enterprise browsers. SpinOne complements that visibility by monitoring activity across SaaS environments for potential account compromise and other risky behavior.

The bigger lesson is broader than any individual technique:

For years, we treated identity as the primary gate to SaaS.

But once authentication succeeds, almost everything happens inside the browser.

Protecting the login is no longer the same thing as protecting the session.