Peak season prep: a cyber checklist for retailers

For most retailers, the final quarter of the year accounts for a huge share of annual revenue. Black Friday, Cyber Monday and the run-up to Christmas leave very little room for error. A website outage, a payment problem or a ransomware attack at the wrong moment can wipe out weeks of planning.

Attackers know this too. Peak season brings more traffic to hide in, more temporary staff, more pressure to keep things running and, for criminals, more leverage.

September is the time to prepare. Here’s a practical checklist.

1. Test your customer-facing systems

Your website, app and checkout will carry more load and more scrutiny than at any other point in the year.

• Commission a penetration test of your e-commerce platform and customer accounts, leaving time to fix what’s found.
• Check for weaknesses that enable card skimming, account takeover and credential stuffing.
• Review third-party scripts on payment pages. Each one is a potential route for attackers.

2. Lock down change before the freeze

Most retailers introduce a change freeze ahead of peak. Use the weeks before it to apply outstanding patches, close unnecessary access and retire systems you no longer use.

3. Prepare for temporary staff

Seasonal workers in stores, warehouses and customer service need access quickly. Make sure:

• Accounts are created with only the access each role needs, with an end date set at creation.
• Shared logins are avoided wherever possible.
• Every temporary worker gets a short security briefing, including how to spot phishing and report concerns.

4. Protect your customers from impersonation

Fake websites, social media ads and phishing emails using your brand spike during peak. Monitor for lookalike domains, set up email authentication so criminals can’t easily spoof your address, and tell customers how you will and won’t contact them.

5. Check your suppliers

Payment providers, logistics partners, marketing agencies and platform vendors all play a part in peak trading. Confirm your critical suppliers have their own security and continuity plans, and know who to call if one of them has an incident.

6. Rehearse your response

If something goes wrong on Black Friday, who decides whether to take the site offline? Who talks to customers and the press? A short tabletop exercise in the autumn makes those decisions far easier under pressure.

7. Make sure someone is watching

Peak trading runs around the clock, and so do attackers. Make sure your systems are monitored 24/7, with the ability to respond quickly to suspicious activity, not just logged for review on Monday morning.

A simple peak season timeline

Working back from Black Friday makes preparation manageable.

September

• Commission penetration testing of e-commerce, apps and customer accounts.
• Review third-party scripts and suppliers involved in peak trading.
• Plan training for permanent and temporary staff.

October

• Fix findings from testing and apply outstanding patches.
• Run a tabletop exercise based on a peak-season incident.
• Confirm monitoring cover and escalation contacts for the busiest days.

Early November

• Begin the change freeze.
• Brief temporary staff on security and reporting.
• Publish customer guidance on how you will and won’t contact them.

Peak weeks

• Watch closely for account takeover, card testing and brand impersonation.
• Keep decision-makers reachable, with a clear route to escalate incidents.

January

• Remove temporary accounts and access.
• Review what happened and feed lessons into next year’s plan.

A timeline like this keeps security from being squeezed out by the many other priorities that come with peak. It also makes it easier to involve the right people at the right moment, from e-commerce and store operations to finance and customer service.