Incident Response Planning: What to Do Before, During, and After a Cyber Breach

Last Updated: June 13, 2026

The Breach Is Not the Problem — Unpreparedness Is

No cybersecurity program can guarantee that a breach will never occur. The threat landscape is too dynamic, the attack surface in most organizations too broad, and the adversaries too adaptive for any set of controls to provide absolute protection. What separates organizations that survive breaches from those that are defined by them is not whether they were attacked — it is how prepared they were to respond when the attack succeeded.

Incident response planning is the discipline of building that preparedness before it is needed. It encompasses the processes, roles, communication protocols, and technical capabilities that determine how quickly an organization can detect, contain, investigate, and recover from a security incident. For businesses in Ontario and across Canada, having a documented incident response plan is increasingly a regulatory expectation as well as a practical necessity.

Organizations working with Brigient on incident and breach response benefit from 24/7 on-demand support for exactly these scenarios — containment, forensic investigation, crisis advisory, and coordination with insurers and legal teams.

Before: Building the Plan While Things Are Calm

Effective incident response planning begins long before any incident occurs. The core components of a pre-incident plan include a clearly defined incident response team with documented roles and escalation paths, classification criteria that define what constitutes an incident and at what severity level, a communication protocol that covers internal notification, customer disclosure if required, regulatory reporting obligations, and media handling, forensic and logging infrastructure that preserves the evidence needed for post-incident investigation, and tested backup and recovery systems that can restore operations without reintroducing the compromise.

Many organizations have some version of these elements but have never tested them under realistic conditions. Tabletop exercises — structured simulations that walk a response team through a hypothetical incident scenario — are one of the most effective ways to identify gaps in planning before those gaps are exposed by an actual event.

Adversary simulations, including red team and purple team exercises, go further — testing not just the plan but the technical defenses that the plan assumes will function correctly. Brigient conducts these exercises as part of a comprehensive approach to incident readiness for Canadian organizations.

During: The First 72 Hours

The first hours of a security incident are disproportionately important. Decisions made in this window — about containment strategy, evidence preservation, stakeholder notification, and external engagement — have consequences that ripple through the entire response and recovery process.

The primary goal in the initial phase is containment: stopping the spread of the compromise without inadvertently destroying the forensic evidence needed to understand what happened and how. This requires technical competence and an incident commander with the authority to make rapid decisions — including the decision to take systems offline, which carries operational costs that must be weighed against the risk of allowing the compromise to continue.

Communication runs in parallel: notifying internal leadership, engaging legal counsel, contacting cyber insurers (early engagement often affects coverage), and, where regulatory timelines require it, initiating the notification process for affected parties or regulators.

After: Recovery and the Post-Incident Review

Recovery is more than restoring systems to operational status. A technically successful recovery that leaves the root cause unaddressed simply resets the clock to the next incident. Post-incident recovery should include forensic investigation to fully understand the attack chain — initial access vector, lateral movement, persistence mechanisms, and data accessed or exfiltrated — remediation of the vulnerabilities and misconfigurations that enabled the attack, implementation of additional controls to prevent recurrence, and a formal post-incident review that translates findings into program improvements.

The post-incident review is also where organizations update their incident response plan based on what they learned about their actual capabilities versus their planned capabilities. Every serious incident reveals gaps. The organizations that improve are the ones that treat those gaps as information rather than embarrassments.

For businesses that want to build genuine incident readiness rather than just documentation, brigient.com offers the full spectrum of pre-incident planning, simulation exercises, and breach response support.

James Scott

James Scott was born in Missouri and studied at the University of Central Missouri. Currently working as Manager at ActoutLoud, James Scott helps readers learn the fields of Law, Marketing, Construction, Education, Health, etc hone their skills, and find their unique voice so they can stand out from the crowd.

Written by James Scott

James Scott was born in Missouri and studied at the University of Central Missouri. Currently working as Manager at ActoutLoud, James Scott helps readers learn the fields of Law, Marketing, Construction, Education, Health, etc hone their skills, and find their unique voice so they can stand out from the crowd.