TL;DR
Monthly security audits catch what weekly checks miss. Budget an hour. You'll work through dependencies, access controls, backups, and the configuration that quietly drifted while you weren't looking. Put it on the calendar for the first Monday of the month, because otherwise it won't happen.
Security drift is real. That access control you set up three months ago has picked up a few stale accounts by now, and your dependencies certainly haven't been updating themselves. Block out an hour, put on some music, and treat this like an oil change for your app. It's a lot cheaper than cleaning up what accumulates when you skip it.
Quick Checklist (5 Critical Items)
Dependency Deep Dive 4
Access Control Audit 4
Backup Verification 3
Configuration Review 4
Building a Security Calendar
Monthly checks are the counterweight to the weekly ones. Weekly reviews catch what just broke: a new advisory, a run of failed logins. Monthly reviews catch what slowly stopped being true. Different problem, different pace.
If you're handling sensitive data in production, add quarterly penetration testing and an annual third-party audit on top of this. Most apps don't need either one.
How long should a monthly security review take?
Plan for about an hour. Your first pass will run longer, because a first pass always turns up a backlog. Once the weekly checks are a habit, less debt piles up between reviews and the monthly one gets quick.
What if I find critical issues during monthly review?
Stop and fix it. Don't finish the checklist first. Write down what you found and when, resolve it, then pick the review back up. Afterwards, work out why the weekly check missed it: that answer is usually worth more than the fix itself.
Should I document these reviews?
Yes. Keep a short log of each review: what you checked, what you found, what you did about it. The pattern that emerges over a few months is the real payoff, and it doubles as evidence of diligence when a compliance questionnaire turns up.
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