How Often Should You Run Security Scans? A Cadence Guide

Cadence is the part of a scanning program that most teams get wrong. The tools are usually fine, the coverage is usually fine, but the schedule drifts until scans only run when someone remembers to click the button. By then a regression has been live for a week.

This guide is about picking a defensible cadence and sticking to it. We focus on three knobs: a base frequency per asset tier, event triggers that override the base, and where lightweight scans belong in CI.

Why cadence beats one-off scans

A point-in-time scan tells you the state of an asset the moment you scanned it. The next deploy, the next dependency bump, or the next config tweak can invalidate the entire result. Vulnerabilities don't wait for your next quarterly assessment, and neither do the people looking for them.

Regular scans turn security from a calendar event into a feedback loop. The same finding showing up twice is a signal you have a regression. A finding clearing on the next run is a signal your fix landed. Neither of those signals exists if you scan once a quarter.

The other thing cadence buys you is honest trend data. Open critical count over time, time to remediation, and time to detection only mean something if the underlying scan stream is consistent. Sporadic scans produce sporadic numbers, and sporadic numbers don't survive a board meeting.

Scan cadence by asset type

Cadence should follow asset criticality, how fast that asset changes, and what your compliance regime demands. A payments service that ships twice a day needs a very different rhythm than an internal HR app that changes twice a year.

Event triggers that demand an extra scan

A fixed cadence is the floor, not the ceiling. Certain events should always trigger a scan on top of the regular schedule:

• Major changes: Architecture changes, framework upgrades, auth provider swaps, new third-party integrations.
• Deploys: Any production deploy to a critical-tier asset. For high-tier assets, at least every release.
• Incidents: After any security incident, scan the affected asset and anything that shares infrastructure or credentials with it.
• Compliance updates: When a framework you're already on the hook for changes (new PCI DSS revision, updated HIPAA guidance), rescan the relevant scope so your evidence reflects the current rules.

Daily vs weekly: how to decide

The simplest rule: scan at least as often as you deploy. If you ship daily, scan daily. Otherwise a regression introduced on Monday morning won't surface until your weekly Friday scan, and you've handed an attacker four days of free real estate.

If you ship weekly or slower, weekly scans are usually enough for the full surface, as long as you've wired event triggers in for the things that matter. Critical-tier assets stay on daily regardless of deploy cadence, because the cost of a missed regression there is what justifies the program in the first place.

Internal apps that change rarely can live on a weekly cadence with on-change triggers. Dev and test environments don't need to be on the same schedule as production, but they should still see a monthly sweep so old branches and stale dependencies don't accumulate quietly.

Scanning in CI: shift detection left

A scheduled scan tells you about issues that already shipped. A CI scan tells you about issues before they ship. Both matter, but the CI scan is cheaper to act on because the author is still in context.

# GitHub Actions Example: Integrate SAST & SCA
name: Security Scan CI

on: [push, pull_request]

jobs:
  security:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4
      - name: Run npm audit (SCA)
        run: npm audit --audit-level=moderate
      - name: Initialize CodeQL (SAST)
        uses: github/codeql-action/init@v3
        with:
          languages: javascript-typescript
      - name: Run CodeQL Analysis
        uses: github/codeql-action/analyze@v3

Run cadence-aware scans with Barrion

Barrion runs scheduled passive scans against your public-facing assets, up to daily, with an alert as soon as a run finds something new. That keeps your base cadence honest without anyone having to remember to click a button.

Start your free security scan with Barrion today and set a cadence that matches how your team actually ships.

Passive scans cover configuration. To test the app itself on the same rhythm, the Business plan can schedule an AI pentest daily, weekly or monthly, and any plan can run one on demand.

For continuous monitoring and trend data across all your assets, visit the Barrion dashboard.