Shared Logins Are a Security Risk for Your Business

21 Oct Shared Logins Are a Security Risk for Your Business

Posted at 15:18h in IT Management, TCT News by TCT

Shared logins usually start with a small, practical decision. Someone needs access to a system, and sending the existing username and password seems like the quickest way to get the job done. Over time, however, they make accounts harder to secure, audit, and manage. When multiple people use the same username and password, it becomes difficult to identify who performed specific actions or respond to security incidents.

Why businesses end up with shared logins

Many shared accounts originate from older systems, small teams, or convenience. Businesses may share access to software or common email addresses rather than creating separate user accounts. While this may seem practical, it often introduces unnecessary security risks.

You can’t reliably see who did what

When multiple people use the same account, all activity is recorded under a single username. This makes it difficult to investigate mistakes, security incidents, or unauthorised changes because there is no clear record of who performed the action.

One password can give access to everything in the account

Shared passwords are often stored in emails, documents, chat messages, or browsers. The more people who know the password, the greater the chance it will be exposed, reused, or compromised. If an attacker obtains the password, they gain the same access as legitimate users.

Shared logins make offboarding harder

When an employee leaves, removing access from a shared account usually requires changing the password for everyone. Because this can disrupt work, businesses sometimes delay updates, leaving former staff with potential access.

MFA is harder to manage with a shared account

Multi-factor authentication works best when linked to an individual user. Shared accounts often lead to employees sharing codes, devices, or authentication approvals, reducing the effectiveness of MFA and making account management more complicated.

Everyone gets the permissions of the shared account

Shared accounts cannot easily enforce different permission levels. Employees may receive access well beyond what they need, increasing the risk of accidental changes, data exposure, or misuse.

A shared mailbox doesn’t require a shared password

If multiple staff need access to a common email address, use features such as Microsoft 365 Shared Mailboxes. Employees can access the mailbox through their own accounts, improving security and accountability.

Administrator passwords should never be passed around casually

Administrator accounts provide elevated access and should never be casually shared. Each administrator should have their own named account, with administrative privileges used only when required.

What if the software only provides one login?

Where software only supports a single account, store credentials in a business password manager rather than sharing them through email or chat. Limit access, require MFA, and regularly review who can use the account.

Service accounts need different handling

Service accounts are used by applications and automated processes, not people. They should have limited permissions, a documented purpose, and clear ownership to ensure they are managed securely.

How to replace shared logins without disrupting work

Start by identifying every shared account in your business. Create individual accounts wherever possible, assign appropriate permissions, enable MFA, and remove unnecessary shared access. For accounts that must remain shared, manage them through an approved password manager and review access regularly.

Robert Brown
21/10/2026