Your Google Workspace Is Not as Secure as You Think

Introduction

Google Workspace is one of the most widely used productivity platforms in the world. Law firms, CPA firms, real estate offices, and professional services organizations rely on it daily for email, file sharing, and collaboration. Many assume that because it runs on Google's infrastructure, it is inherently secure.

That assumption is wrong. Attackers are not breaking into Google's data centers. They are logging into your users' accounts, abusing misconfigured sharing settings, and exploiting third-party app integrations to gain persistent access. The attack surface is identity-based, and most organizations have significant gaps.

Account Takeovers Are Common and Often Go Undetected

Gmail is one of the most phished platforms in existence. Attackers use credential stuffing, adversary-in-the-middle phishing kits, and OAuth consent abuse to compromise accounts without ever needing to bypass 2-Step Verification. Once inside, they blend into normal user activity, making detection difficult without active monitoring.

In many cases, compromised accounts are used to send internal phishing emails, redirect payment instructions, or silently forward communications to attacker-controlled addresses. The damage accumulates before anyone realizes something is wrong.

2-Step Verification Is Not Enough on Its Own

Enabling 2-Step Verification is a baseline, not a complete defense. Attackers bypass it routinely through real-time phishing proxies that intercept session tokens, SMS interception and SIM swapping, and push notification fatigue attacks that trick users into approving fraudulent logins. Without enforcing phishing-resistant methods like hardware security keys or passkeys, 2SV provides a false sense of security.

OAuth App Abuse Is a Growing Problem

Google Workspace allows users to grant third-party applications access to their accounts through OAuth. Many organizations have no visibility into which apps have been authorized or what permissions they hold. Attackers exploit this by tricking users into granting malicious apps access to Gmail, Drive, and Contacts. Once authorized, the app retains persistent access even if the user's password is changed.

This technique is commonly used in business email compromise campaigns targeting law firms and financial services companies. The access is legitimate in Google's eyes, which means standard security alerts often do not fire.

Google Drive Sharing Is a Silent Data Exposure Risk

Google Drive's default sharing model is permissive. Files and folders can be shared publicly, with anyone who has the link, or broadly across the organization without the owner fully understanding the scope. In professional environments handling client data, contracts, and financial records, this creates significant exposure.

Many organizations do not audit what has been shared externally, who has editor access to sensitive documents, or whether former employees still retain file access after offboarding. Each of these gaps represents a potential data breach waiting to happen.

Admin Console Misconfigurations Are Everywhere

The Google Workspace Admin Console provides powerful controls, but they require deliberate configuration. Common misconfigurations include allowing users to install any third-party app without review, failing to enforce strong authentication policies across all organizational units, leaving external sharing unrestricted for Google Drive and Google Meet, and not enabling advanced phishing and malware protections in Gmail settings.

Most small and mid-sized organizations set up Google Workspace, accept the defaults, and never revisit the configuration. Attackers know this and target accordingly.

No Visibility Means No Detection

Google Workspace generates a substantial amount of audit log data covering login events, file access, sharing activity, and admin actions. Most organizations never look at it. Without active monitoring, impossible travel events, bulk file downloads, and suspicious OAuth grants go unnoticed until significant damage has already occurred.

In one engagement we handled, an attacker had maintained access to a law firm's Google Workspace environment for over two weeks. They had set up a Gmail filter to silently forward all emails matching financial keywords to an external address. The forwarding rule was discovered only after a wire transfer discrepancy was flagged by the client's bank.

Privileged Accounts and Super Admins Are High-Value Targets

Google Workspace Super Admin accounts have unrestricted control over the entire tenant. If compromised, an attacker can create new accounts, reset passwords, disable security controls, and exfiltrate data at scale. Many organizations have multiple Super Admins, use them for daily tasks, and have no monitoring on privileged activity. This is the organizational equivalent of leaving the master key under the doormat.

Offboarding Gaps Leave Doors Open

When employees leave, their Google accounts are often suspended rather than fully deprovisioned. Shared drives they owned may retain their access credentials. Third-party apps authorized under their account continue to hold active tokens. Without a formal offboarding process that addresses Workspace specifically, former employees and the apps they authorized can remain a persistent risk for months or longer.

How to Reduce Your Exposure

Reducing risk in Google Workspace requires addressing both configuration and visibility. Organizations need to enforce phishing-resistant authentication, audit and restrict third-party app access, review and tighten Drive sharing policies, monitor audit logs for anomalous activity, and establish a clear offboarding checklist that covers Workspace specifically. Security is not a one-time setup. It is an ongoing posture that requires periodic review.

Final Thoughts

Google Workspace is a powerful platform that is widely trusted and widely misconfigured. Attackers do not need to find a zero-day vulnerability. They need a phishable user, a permissive OAuth policy, or an unmonitored admin account. If your organization has not reviewed its Workspace security posture recently, the gaps are almost certainly there.