A website maintenance plan should protect the site's software, accounts, customer data, payment path, backups, and recovery process. A monthly reminder to update plugins is not enough. Keep an inventory, prioritize known exploitation, test changes, review access, monitor failures, and prove that a clean restore works.
Inventory what must be maintained
List the domain registrar, DNS provider, hosting account, content management system, themes, plugins, libraries, forms, analytics, payment integrations, email services, repositories, deployment tools, secrets, and backup destinations. Assign an owner and replacement contact to each component. Record supported versions and renewal dates.
Map the data handled by forms, accounts, analytics, logs, and third parties. Keep only what has a defined purpose and retention period. Review privacy notices and consent behavior whenever collection changes. Remove abandoned plugins, test sites, accounts, API keys, and old exports instead of leaving them as invisible maintenance debt.
Patch by risk, not convenience
NIST defines patch management as identifying, acquiring, installing, and verifying patches. NIST notes that patches correct security and functionality problems and often mitigate software-flaw vulnerabilities. A plan therefore needs discovery and verification, not only an install button.
Track vendor advisories for every supported component. Use CISA's Known Exploited Vulnerabilities Catalog as an input to prioritization because CISA describes it as the authoritative source of vulnerabilities exploited in the wild. Patch actively exploited issues promptly according to documented risk and vendor guidance. Do not postpone a critical fix merely to preserve a convenient maintenance window.
Stage risky changes when possible. Back up first, record the current version, apply one bounded change, and test critical paths: home page, login, forms, search, checkout, redirects, analytics, accessibility, and mobile layouts. Keep a rollback procedure and document why a patch was deferred.
Review accounts and configuration
Use individual administrator accounts, least privilege, MFA, and a scheduled access review. Remove former staff and contractors, revoke unused tokens, and protect registrar, DNS, hosting, repository, and payment accounts with particular care. Confirm recovery contacts and ownership before an emergency.
OWASP's Top 10:2025 includes broken access control, security misconfiguration, software supply-chain failures, authentication failures, and security logging and alerting failures among critical web-application risk categories. Translate those categories into concrete checks for roles, exposed files, default settings, third-party code, authentication, and alert coverage.
Back up, monitor, and rehearse recovery
Keep backups separate from the live site and protect them with restricted access and encryption appropriate to the data. Define frequency and retention from the amount of acceptable data loss. A backup is not proven until a restore test confirms that the database, uploads, configuration, secrets, and deployment steps produce a working site.
Monitor uptime, certificate expiry, domain renewal, failed jobs, error rates, suspicious administrative activity, file changes, and form delivery. Route alerts to a person who can act, and test the alert path. Document who can disable a compromised integration, restore a release, contact vendors, and communicate with affected users.
Keep evidence and review the plan
For each maintenance cycle, record the inventory reviewed, versions changed, advisories checked, tests performed, backup identifier, restore-test date, access changes, alerts reviewed, failures, and follow-up owner. Keep secrets out of the log.
Review the plan after a major release, new vendor, staff change, incident, failed restore, or material data-collection change. A good maintenance plan is a repeatable control system: it knows what exists, responds to real risk, limits access, detects failure, and can recover without guessing.
Sources
- Patch management — National Institute of Standards and Technology
- Known Exploited Vulnerabilities Catalog — Cybersecurity and Infrastructure Security Agency
- OWASP Top 10:2025 Introduction — OWASP Foundation