Why Shared Logins Are a Security Risk for Your Business
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.
Maybe an employee needs to send an invoice, update your website, or check a customer record, so a colleague forwards the login the whole team uses.
The username might be accounts@yourbusiness.com, admin, or the name of an employee who left years ago. The password may already be saved in a browser, written in an internal document, or sitting in an old message thread.
The employee signs in, finishes the task, and gets back to work. From their point of view, the login did exactly what it was supposed to do.
The problems usually appear later.
A payment is changed, a customer record disappears, or someone signs in from an unfamiliar location. You check the account history, but every action appears under the same username. Several current employees know the password, former employees may still remember it, and nobody can say with confidence who used the account.
Shared logins often begin as a quick way to give someone access. Over time, they make the account harder to secure and much harder to manage.
Why businesses end up with shared logins
Most businesses don’t set out to create a collection of shared accounts.
A piece of software may have been purchased when the company had only two employees. The original owner created one login and passed it to the next person who needed it. As the team grew, sharing the existing password felt easier than creating separate accounts or reviewing the software plan.
Sometimes the software doesn’t support multiple users. In other cases, adding users costs more, or nobody has taken the time to configure the access already included with the service.
Shared accounts also appear when several people monitor the same email address. Staff may all sign in directly to sales@, support@, or accounts@ because nobody showed them how to use a shared mailbox or delegated access.
The arrangement can keep working for years. That doesn’t make it safe.
You can’t reliably see who did what
When five people use one login, the software usually records the activity under that shared account.
You may be able to see that the account signed in, edited a record, downloaded a report, or changed a payment instruction. You may not be able to tell which of the five people performed the action.
That missing detail causes problems even when everyone involved has acted properly. A mistaken change can take longer to trace because you have to ask several people what they were doing at the time.
It becomes more serious when the activity may be fraudulent. If someone exports customer information or changes bank details, you need to know whether the action came from an employee, a former employee, or an attacker using the shared password.
The UK National Cyber Security Centre recommends giving each employee a separate work account. Its guidance notes that shared accounts make it harder to connect an action to a particular person and can increase the amount of information exposed if the account is compromised.
One password can give access to everything in the account
A shared password has to reach every person who needs it.
That often means the password is copied into email, sent through chat, saved in a shared document, or entered on several computers. Each additional copy gives someone another place to find it.
The risk also grows as more people receive the password. One employee may enter it on an infected computer. Another may save it in a personal browser profile. Someone else may reuse it on a different service.
If an attacker steals the shared password, they receive the same access as everyone else using the account. And because the login is used by several people, an unfamiliar sign-in may be dismissed as another employee working from home or using a new device.
Named accounts make unusual activity easier to investigate. If an employee who normally works in one country suddenly signs in from somewhere else, your IT provider has a specific account to check and disable.
With a shared account, disabling the login may also stop several employees from working while the investigation takes place.
Shared logins make offboarding harder
When an employee with an individual account leaves, your IT provider can disable that account without affecting anyone else.
A shared login works differently. The former employee may still know the username and password, so removing their access usually means changing the password and giving the new one to everyone who remains authorized.
That creates another round of messages, saved passwords, and browser updates. If the account is connected to an application, device, or automated process, changing the password may also interrupt that connection.
Because of the inconvenience, businesses sometimes leave the password unchanged. The former employee’s access then depends on whether they remember the password or still have it saved on a device.
Current Australian government guidance says credentials should be changed when membership of a shared user account changes. With individual accounts, you can remove one person without changing how everyone else signs in.
MFA is harder to manage with a shared account
Multi-factor authentication, or MFA, asks for another form of proof after the password. That might be a code from an authentication app, a security key, or approval on a trusted device.
The second factor is meant to belong to the person signing in. The NCSC describes it as something that only the account holder can access.
A shared account can make that difficult. The MFA prompt may go to one employee’s phone even when someone else is trying to sign in. Staff may start forwarding codes, approving prompts for each other, or leaving a shared device in the office.
Some services allow several security keys or passkeys to be registered to one account, which is better than sharing a single authentication code. Even then, individual accounts are usually easier to manage because each person has their own login and their own MFA method.
You can remove one employee’s sign-in without changing anyone else’s.
Everyone gets the permissions of the shared account
When several people use the same login, each person can use whatever permissions have been given to that account.
An employee who only needs to view customer records may also be able to export them. Someone who needs to publish a website update may also have access to user accounts, billing information, or security settings.
Individual accounts let you match access to the employee’s job. Your bookkeeper can receive the financial access they need without becoming an administrator. A marketing employee can update website content without being able to install software or change every setting.
This is known as the principle of least privilege. Each person receives the access needed for their work and no more.
Cyber.gov.au’s guidance for businesses recommends individual user accounts, limited permissions, and regular access reviews. It also warns that shared accounts make suspicious activity harder to detect and investigate.
A shared mailbox doesn’t require a shared password
Several employees may need to read and reply to messages sent to an address such as accounts@yourbusiness.com or support@yourbusiness.com.
That doesn’t mean they all need to sign in using the same password.
Microsoft 365 shared mailboxes, for example, allow approved employees to open a common mailbox through their own accounts. Microsoft says that a shared mailbox isn’t intended for direct sign-in and recommends keeping sign-in blocked for the mailbox account.
Each employee signs in using their own identity, and an administrator gives them permission to use the shared mailbox. When someone leaves, their permission can be removed without changing access for the rest of the team.
Other business platforms offer similar features under names such as delegation, team access, user roles, groups, or shared inboxes.
Before sharing a password, check whether the software already provides one of these options.
Administrator passwords should never be passed around casually
Shared administrator logins deserve extra attention because they can change security settings, create users, access sensitive information, or remove other people’s access.
If several employees use the same administrator account for everyday work, a mistake or stolen password can affect far more of the business.
Give each administrator a named account wherever the system allows it. Staff should use standard accounts for normal work and switch to administrator access only when a task requires it.
Your IT provider should also review who currently has administrator access. Employees often keep permissions from previous roles because nobody removed them when their responsibilities changed.
What if the software only provides one login?
Some older applications, devices, and online services don’t support separate user accounts. Replacing the software may take time, especially if the system is tied to important business processes.
In that situation, keep the password inside a business password manager instead of sending it through email or chat. Give access only to the employees who need it and review that list when someone changes roles or leaves.
The password manager should require each employee to sign in with their own account and MFA. That gives you more control over who can retrieve the shared credential, and some business password managers record when a user views or uses it.
The NCSC recommends using delegated access instead of password sharing wherever possible. When sharing cannot be avoided, it advises limiting access to a small group, reviewing it regularly, and changing the password when someone is no longer allowed to use the account.
Assign an owner to every remaining shared account. That person should know who has access, what the account controls, where its recovery details are stored, and what would stop working if the password changed.
Service accounts need different handling
Your IT provider may mention service accounts when reviewing shared logins. These are accounts used by software, devices, or automated processes rather than by employees.
For example, a backup application may use an account to reach a server, or a business system may use one to move information between two applications.
A properly managed service account is different from a password that several employees use to sign in. It should have only the permissions required for its task, and its credentials should be protected from employees who don’t need them.
Service accounts should also have a named owner, documented purpose, and a process for replacing their credentials if they’re exposed. Your IT provider can identify these accounts so they aren’t mistaken for normal employee logins or disabled without checking what depends on them.
How to replace shared logins without disrupting work
accounting software, customer systems, social media tools, website administration, email accounts, cloud storage, and any specialist applications used by their teams.
Old messages and spreadsheets may reveal accounts that were forgotten long ago. Your password manager, browser password stores, and software subscription records can also help.
Once you have the list, record who uses each account and why. That will tell you whether the software needs individual users, delegated access, a shared mailbox, or another arrangement.
Create named accounts where the platform supports them, then give each employee only the permissions required for their role. Set up MFA for each user and test the new access before removing the old login.
For accounts that still have to be shared, move the password into an approved business password manager. Limit access, document the owner, and change the password whenever someone leaves the authorized group.
Make the same review part of onboarding, role changes, and offboarding. Shared accounts usually return when a new employee needs access quickly and nobody knows the correct way to provide it.
Frequently Asked Questions
Is it ever acceptable to use a shared login?
Sometimes a device or older application only supports one account. If you cannot replace it immediately, restrict access to the smallest possible group, keep the password in a business password manager, monitor its use, and change it whenever access changes.
Can we share an account if MFA is enabled?
MFA reduces the risk of a stolen password, but it doesn’t restore individual accountability. Several people are still using one identity, so activity may remain difficult to trace. Use separate accounts whenever the service supports them.
Are shared email addresses unsafe?
The address itself isn’t the problem. Several employees can use a shared address safely when they access it through their own accounts. Avoid giving everyone the password to one mailbox.
Do we need to replace every shared account at once?
Begin with accounts that have administrator access or contain sensitive business, customer, employee, or financial information. Then work through the remaining accounts based on the access they provide and how many people know the password.
What should we do when an employee leaves?
Disable their individual accounts and remove their delegated access. If they knew any shared passwords, change those passwords and review the account for recovery methods, devices, sessions, or integrations that may still give them access.
If your business still relies on shared logins, ask your IT provider to review them and recommend a safer way to give staff access. If you don’t have an IT provider, you can always reach out to us and we’ll help you sort them out.
This Article has been Republished with Permission from The Technology Press.