Back to Work: The 10-Point Post-Vacation Security Checklist

The construction holiday wrapped up on August 1, and offices across Quebec are filling back up this week. Coffee is brewing, inboxes are overflowing, and somewhere in your building a laptop that hasn't been powered on since mid-July is about to reconnect to your network. Attackers know this rhythm as well as you do. That's why a post-vacation security checklist belongs at the very top of your first week back.

We took it easy on the blog this summer too. Consider this our "we're back" post: an energetic, practical 10-point IT security reset you can run in a single afternoon.

Key Takeaways

• Early August is prime attack season: stale auto-replies, unpatched laptops, and overloaded inboxes create easy openings.
• Patch every endpoint and review Entra ID sign-in logs before normal work resumes.
• Repeated MFA prompts that users denied during the break can signal a stolen password.
• Confirm backups ran through the holiday and test at least one restore.
• A short team briefing on day one closes the loop and sets the tone.

Why Attackers Love the First Week of August

The 2026 vacances de la construction ran from July 19 to August 1, and for those two weeks a large share of Quebec businesses operated on skeleton crews. Attackers pay attention to that calendar just like everyone else.

Four things make the return window attractive. First, out-of-office replies have been broadcasting absences for two weeks, often with a helpful "please contact my colleague" line that maps out your org chart for fraudsters. Second, laptops that sat closed in a cottage drawer missed the July security updates. Third, employees come back to hundreds of unread messages and clear them fast, which is exactly the state of mind phishing is designed for. Fourth, criminals who captured a password in June or July often wait for the return rush, then bombard the user with MFA push prompts hoping one gets approved in the chaos. Based on field observations, the first ten days back are when these quiet compromises turn into loud incidents.

The good news: a structured reset closes most of these doors in a few hours.

The 10-Point Post-Vacation Security Checklist

Work through these in order. Points 1 to 5 cover machines and identities, points 6 to 10 cover mail, access, and people.

1. Run a full patch sweep

Every device that slept through the holiday missed at least one update cycle. Push Windows and macOS updates, then check your Intune compliance report for machines that haven't checked in since mid-July. Don't forget browsers, VPN clients, and firewall firmware. Attackers love the components nobody watches.

2. Review Entra ID sign-in logs for the holiday window

Open Entra ID and filter sign-in logs from July 19 to August 1. Look for sign-ins from unfamiliar countries, impossible travel flags, and legacy authentication attempts. If you've deployed the policies from our free Conditional Access baseline, most risky patterns are already blocked, but the logs still tell you who was knocking.

3. Hunt for MFA fatigue attempts

MFA fatigue is the tactic of spamming a user with authentication prompts until they tap Approve just to make the phone stop. Check for accounts with repeated denied or ignored MFA prompts over the break. Ask those users directly whether they received prompts they didn't trigger. If the answer is yes, treat the password as compromised and reset it today.

4. Retire every out-of-office reply

Stale auto-replies do double damage: they look sloppy to clients, and they keep feeding attackers names, dates, and backup contacts. Have everyone clear their away message on day one, including shared mailboxes and voicemail greetings that mention absences.

5. Triage the email backlog with care

The post-vacation inbox is a minefield of fake invoices, "your password expired" alerts, and urgent requests supposedly sent while you were away. Encourage the team to slow down on anything asking for payment, credentials, or gift cards. Our visual guide to spotting phishing is a good refresher to circulate this week.

6. Check inbox rules and mail forwarding

An intruder who slipped in during the quiet weeks usually creates hidden inbox rules that delete or forward security alerts. Audit rules and external forwarding created since mid-July across the tenant. A rule named with a single dot, or forwarding to an outside address, is a red flag worth escalating.

7. Revoke temporary access

Vacation coverage means delegated mailboxes, temporarily elevated permissions, shared calendars, and guest accounts for backfill contractors. List everything granted in June and July, then remove what's no longer needed. Standing access that outlives its purpose is how small exceptions become permanent holes.

8. Reset shared and risky passwords

If a password got texted to a colleague "just for while I'm away," rotate it now. Check your breached credential reports too. Any account flagged during the holiday gets a fresh password and a forced sign-out from all active sessions.

9. Verify your backups actually ran

Backup jobs fail silently, and nobody watches dashboards from a dock in Charlevoix. Confirm your Microsoft 365 and server backups completed every day of the shutdown, then restore one mailbox item and one file as a live test. If that exercise reveals gaps, our backup and recovery service exists precisely for this situation.

10. Brief the team

Take fifteen minutes at your first staff meeting. Tell everyone the phishing wave is coming, show one real example, and repeat the reporting path: forward suspicious messages, no blame, no questions. A team that reports fast shrinks every incident.

Make the Reset Stick Beyond August

This checklist works just as well before the December holidays and after spring break, so put it in the calendar now. Better yet, automate the repetitive parts: Intune can enforce patch compliance, Conditional Access can block risky sign-ins on its own, and a monitored tenant surfaces MFA fatigue attempts in near real time instead of two weeks later. That's the core of our managed cybersecurity service, where the reset becomes a routine instead of a scramble.

An afternoon of checking beats a month of incident response. Ask anyone who has lived through the alternative.

FAQ

What should be on a post-vacation security checklist?

Start with a patch sweep of every device, a review of sign-in logs for the vacation window, and a hunt for suspicious MFA prompts. Then clean up out-of-office replies, audit inbox rules and forwarding, revoke temporary access, reset shared passwords, verify backups, and brief the team. Ten focused points cover the large majority of post-vacation risk.

What is MFA fatigue and why does it spike after vacations?

MFA fatigue is an attack where a criminal who already has your password floods your phone with approval prompts until you accept one. It spikes after vacations because attackers collect passwords during the quiet weeks, then strike when employees are distracted by overflowing inboxes and more likely to tap Approve without thinking.

How do I check Entra ID sign-in logs for suspicious activity?

In the Microsoft Entra admin centre, open Monitoring, then Sign-in logs, and filter by the date range of the vacation. Watch for unfamiliar locations, impossible travel detections, legacy authentication protocols, and repeated failures followed by a success. Entra ID Protection can also surface risky sign-ins automatically if your licensing includes it.

Are out-of-office replies really a security risk?

They can be. An auto-reply confirms your address is active, announces exactly when you're away, and often names a colleague to contact, which gives fraudsters everything needed for a convincing impersonation. Keep away messages brief while you're gone, and remove them the morning you return.

The first week back sets the tone for the whole fall. Run the ten points, close the doors attackers were counting on, and start the season knowing exactly where you stand. If you'd rather have a partner run this reset with you, book a free IT assessment and we'll go through it together.