Why password spreadsheets are your biggest security blind spot
Password spreadsheets are more common than most people realise. We see them regularly across client environments (saved on desktops, shared over email, stored in OneDrive folders), and most people who use them don't think of them as a security problem. They feel organised and accessible.
They are also one of the most consistent risks our security operations team detects.
Your passwords are your digital identity
Every account you access with a password (your email, your business systems, your cloud storage, your financial platforms) is part of your digital identity. That identity is what proves you are who you say you are when you log in. It’s what controls your access across every system, application, and file your business relies on.
When passwords are compromised, so is that identity. In a credential-based attack, access can be exploited long before anyone realises something is wrong.
Huntress's
2026 Cyber Threat Report found that 37% of identity-based threats stemmed from stolen or suspicious-footprint credential logins, which shows just how far a single weak or reused password can travel through your business.
Credential abuse plays a role in 39% of breaches at some point in the attack chain, making it one of the most persistent threats organisations face, according to the
Verizon 2026 Data Breach Investigations Report.
We see this pattern play out across the businesses we work with too. Attackers are increasingly
relying on valid, trusted credentials rather than sophisticated exploits to get into business systems quietly, then moving fast once they're in.
What makes a spreadsheet particularly risky?
Storing passwords in a spreadsheet may feel organised, but without encryption, access control, or an audit trail, it’s putting your business’s sensitive data at risk. If the device it sits on is compromised, every credential in that file is immediately readable. A single detection event can expose dozens or hundreds of credentials at once.
There is also a data governance risk: if your business does not know where a password spreadsheet is stored or who has permission to access it, the information inside may be discoverable by Microsoft Copilot and surfaced to users who already have access through overly broad or misconfigured permissions.
As we explored in
Are you adopting AI faster than you can secure it?, Copilot does not create new permissions, but it can make existing access and data-governance gaps much easier to expose.
26% of people save their passwords in a note on their computer or mobile device. It might look like a practical shortcut, but in security terms, it’s a plaintext list of keys to your business.
Password reuse compounds the risk. A spreadsheet does nothing to encourage strong, unique passwords for every account, and that habit matters more than most people realise. A
Cybernews analysis of over 19 billion leaked passwords found that 94% were reused or duplicated across accounts, meaning a single breach can cascade across an entire digital footprint.
A digital vault does the heavy lifting
A password manager, sometimes called a digital vault, solves the core problem without disrupting how your team works. The tool we recommend and deploy for our clients is LastPass.
Instead of managing credentials in a spreadsheet, LastPass stores everything in one secure place and lets employees log in with their existing Microsoft Entra ID, Google Workspace, or Okta credentials.
For most businesses already running Microsoft 365, that means no new login to learn or remember.
You only need to remember one password. LastPass automatically generates long, unique passwords for every web service and works across desktops, laptops, and mobile devices with real-time sync.
It also eliminates shared spreadsheets and replaces them with a secure solution. LastPass is built on a zero-knowledge model, meaning sensitive data is protected even from the platform itself. Your credentials are encrypted before they leave your device, so only you can access what is in your vault.
What this looks like across your organisation
For businesses managing a team, LastPass not only allows secure password sharing but also provides a security dashboard that highlights weak, reused, and old passwords, as well as accounts with no MFA enabled, broken down by user.
It also includes dark web monitoring, which alerts you if any enrolled email addresses appear in known breach data.
User onboarding and offboarding can be automated by syncing with Microsoft Active Directory, Entra ID, Okta, or Google Workspace. That means when someone leaves, their access is removed cleanly without credentials lingering in an unmanaged state.
This kind of groundwork matters just as much when it comes to your AI adoption plans. We touched on this in
AI: Your ultimate productivity multiplier: the strength of your identity and access controls directly shapes how safely your business can take advantage of tools like Microsoft Copilot.
The cost of leaving it unaddressed
The
ASD's ACSC 2024–25 Annual Cyber Threat Report found that cybercriminals are continuing their aggressive campaign of credential theft, purchasing stolen usernames and passwords from the dark web to access personal email, social media, and financial accounts.
For Australian businesses, that activity carries a measurable and growing financial consequence.
The
average cost of a data breach in Australia has climbed to AUD $4.22 million. Where the abuse of valid credentials is the initial attack vector, that figure rises to AUD $4.87 million per breach, making compromised passwords among the most expensive security failures a business can face.
A password manager is a quick, easy security tool for businesses to deploy with minimal disruption to the team’s day-to-day work. It cuts down credential theft risk, discourages reuse, and puts an end to storing sensitive information in unprotected files, which is precisely the behaviour our security operations team flags as a risk.
What to do next
If your team is currently managing passwords in spreadsheets, shared documents, or notes saved on their devices, now is a good time to explore what a better approach looks like for your business.
Let us help you turn your password spreadsheet into a digital vault. for more information and we’ll walk you through your options.
