Accidental Data Breaches at Work: How to Prevent Them
Accidental Data Breaches at Work: How They Happen and How to Prevent Them
When people hear “data breach”, they picture hackers. In reality, a large share of breaches at small and medium-sized businesses are accidents: an email sent to the wrong person, a laptop left on a train, a file shared more widely than intended. Nobody meant any harm, but the consequences under data protection law can be just as real.
Here’s what counts as a breach, the mistakes that cause most of them, what to do if one happens, and the simple steps that prevent them.
What Counts as a Data Breach
Under UK GDPR, a personal data breach is any security incident that leads to personal information being lost, destroyed, changed, disclosed to the wrong people, or accessed without permission. That covers far more than theft. Accidentally deleting a client database you can’t restore is a breach. So is emailing a spreadsheet of staff details to the wrong address.
The Most Common Accidental Breaches
- Emails to the wrong person. Usually down to email autocomplete suggesting the wrong contact with a similar name.
- The wrong attachment. Sending one client another client’s documents.
- CC instead of BCC. Revealing everyone’s email address in a group email.
- Lost or stolen devices. A laptop or phone without encryption, holding emails and files.
- Oversharing. “Anyone with the link” sharing on a file that gets forwarded on.
- Work data in personal places. Files emailed to a personal account or copied to a USB stick.
- Leavers’ accounts left active. A former employee still able to sign in weeks after leaving.
- Paper and post. Letters sent to an old address, or documents left on a desk or printer.
What to Do If It Happens
The worst response is to hide it. The best is to act quickly and calmly.
- Contain it. Ask the recipient to delete the email, remove the sharing link, change passwords, or remotely wipe a lost device.
- Work out what was involved. Whose data, what kind, and how many people.
- Assess the risk. Could it lead to harm such as fraud, financial loss or distress for the people affected?
- Report it if needed. If a risk to people is likely, it must be reported to the Information Commissioner’s Office (ICO) without undue delay and, where feasible, within 72 hours of you becoming aware of it. You don’t need the full picture before reporting; the ICO encourages businesses to report early and update later.
- Tell the people affected if the risk to them is high, so they can protect themselves.
- Record it. Keep a note of every breach, what happened and what you did, even the ones you don’t need to report.
The ICO’s website has guidance to help you decide whether a breach needs reporting. This article is general guidance rather than legal advice, so if you’re unsure, check with the ICO or a data protection adviser.
How to Prevent Them
Most accidental breaches can be prevented with a mix of sensible settings and good habits.
Settings that catch mistakes:
- Warnings in Outlook when emailing someone outside your business
- A short delay before emails are sent, so there’s time to stop a wrong one
- Encryption on every laptop and phone, so a lost device doesn’t mean lost data
- Mobile device management, so company data can be wiped from a lost or stolen device
- Multi-factor authentication, so a leaked password isn’t enough to get in
- Sharing limits in Microsoft 365, and data loss prevention tools where your plan includes them
Habits that help:
- A proper leaver process, so accounts are closed on someone’s last day
- Sharing files with named people rather than “anyone with the link”
- Keeping work files in work systems, not personal email or USB sticks
- A culture where staff feel safe owning up quickly, because the first few hours matter most
Where CCSW Comes In
We help businesses across South Wales and the UK set up the protections that stop simple mistakes becoming breaches: email safeguards, device encryption and management, multi-factor authentication, sensible sharing settings in Microsoft 365, and a clean leaver process. It’s all part of our cyber security services.
If you’d like to know how exposed your business is to an accidental breach, get in touch and we’ll take a look.
