The MSSP Handoff Problem: Where Detection Ends and Response Gets Complicated

Managed Security Services can give security teams greater visibility and access to specialized expertise, but finding a threat is only one part of incident response. Once an alert becomes an incident, the operating model between an internal security team and its managed security service provider (MSSP) becomes critical.

During an active incident, several actions may need to happen quickly: validate the threat, determine its scope, isolate an endpoint, disable an account, block malicious traffic, preserve evidence, engage IT teams, and escalate to business leadership. Each action can cross organizational boundaries and require a different level of authority.

That creates an operational seam. The MSSP may have the evidence and expertise to recommend an action, while the internal team has the business context, system access, and authority to approve or execute it. Organizations that define how that seam works before an incident can move from investigation to response with fewer delays and less ambiguity. Many MSSP relationships define what the provider monitors but not who is allowed to act. That gap rarely surfaces in a service review; it surfaces during an incident, often after hours, when a containment decision is waiting on an approver nobody can reach.

As Forrester notes in their recent report, Best Practices For MDR To-IR Handoffs, "During an incident, what organizations often miss are the processes they assume are a given and will happen as a matter of course, like handoffs between providers." The challenge is the transition from threat detection to coordinated action across multiple teams and stakeholders.

Where the MSSP handoff gets complicated and an incident is declared

Consider a compromised employee account. An MSSP might identify suspicious authentication activity, correlate it with other telemetry, investigate the behavior, and determine that the account is likely compromised. The logical containment step may be to disable the account or revoke active sessions.

Taking that action introduces considerations beyond threat detection. The account could belong to an executive, administrator, service owner, or employee supporting a time-sensitive business process. The response may require coordination with identity teams, the user’s manager, IT operations, or other stakeholders.

The same challenge applies to isolating endpoints, blocking network traffic, taking servers offline, or restricting access to critical applications. Technical urgency and business impact have to be considered together.

Here is how that can play out in practice. It is 2:00 a.m. on a Saturday. The MSSP confirms the compromise and recommends revoking the user’s sessions, but the agreed process requires customer approval before acting on executive accounts. The primary contact does not answer. The backup contact changed roles months ago. By the time someone with authority approves the action, the attacker has had hours to register a new MFA device and create mail-forwarding rules. Each team did its job; the gap was in the operating model between them.

This is where the relationship between internal teams and MSSPs needs to be operationally specific. Service scope should translate into a shared understanding of what the provider investigates, what it can act on independently, which actions require customer authorization, and how responsibility changes as an incident becomes more severe.

Those expectations should also extend beyond normal business hours. A response model that depends on reaching one specific internal contact can create a bottleneck during nights, weekends, or holidays. Organizations need primary and backup contacts, defined escalation thresholds, and predetermined rules for situations where an authorized decision-maker cannot immediately be reached.

The handoff also changes character at a specific point: when someone declares an incident. Before that point, the MSSP is triaging and escalating alerts. After it, the organization’s incident response plan takes over, an incident commander assumes coordination, often under external counsel, and obligations such as evidence preservation, regulatory notification timelines, and cyber insurance reporting may begin. The escalation framework should name who can make that declaration, what criteria trigger it, and how the MSSP’s role shifts once it is made.

Forrester warns that "Misaligned handoff protocols between MDR and IR providers lead to conflicting direction, inconsistent situational context, and slowed decision-making during the most time-critical phases of an incident."

For high-severity scenarios such as ransomware or confirmed data exfiltration, the response often extends well beyond the internal team and the MSSP. Breach counsel may be engaged early, the cyber insurer may require an approved incident response firm , and dedicated forensics teams may take over scoping. In many cases, these stakeholders are brought together only after a major incident occurs, making it critical to define expectations in advance around roles, decision authority, evidence sharing, communications, and reporting requirements.

Define four types of ownership

A practical escalation framework can start by assigning four types of ownership: investigation, containment, communication, and decision-making.

1. Investigation ownership establishes how far the MSSP should take an investigation before escalating it. Internal teams should know what information will arrive with that escalation, including affected assets and identities, indicators of compromise, investigation steps, severity, supporting evidence, and recommended actions. A consistent evidence package allows the internal team to build on the provider’s work rather than retracing it. Investigation should also account for a common transition during major incidents: the handoff from the MSSP’s security operations center (SOC) team to a digital forensics and incident response (DFIR) team. With many providers, that escalation involves a third party, which can introduce delays while contracts are activated, accounts are provisioned, access to data is established, and new investigators are brought up to speed. Organizations should define in advance how that transition occurs, what information is transferred, and who maintains continuity throughout the investigation. Providers with integrated MSSP and DFIR capabilities can help reduce additional friction during this phase of the response.
2. Containment ownership defines who has authority to disrupt potentially malicious activity. Organizations should document who can isolate an endpoint, disable an account, block infrastructure, quarantine messages, restrict network access, or take a system offline. Some organizations may authorize their managed security service provider to perform predetermined actions under defined conditions, while others may require internal approval. The important consideration is that both parties understand the boundaries and the process for exceptions. Containment ownership should also account for evidence: reimaging a system or deleting malicious artifacts too quickly can destroy the forensic data needed to understand scope. Ownership should extend beyond initial containment into recovery activities, including heightened monitoring, validation that the threat actor has been removed, and decisions about when systems can safely return to production. Unclear communication between internal teams, the MSSP, and third-party responders during this phase can create new risks, such as restoring access too soon or unnecessarily extending operational disruptions.
3. Communication ownership connects the security response with the rest of the organization. IT operations may need to rebuild devices. Identity teams may need to revoke credentials. Application owners can provide context about affected systems. Legal, privacy, communications, and executive teams may need to participate as severity increases. The escalation framework should identify who engages these stakeholders, through which channels, and at what point in the response.
4. Decision ownership becomes increasingly important as potential business impact grows. The team performing technical analysis may recommend containment, while an incident commander or business leader holds authority to approve an action with significant operational consequences. Severity levels should therefore map to specific decision-makers, including alternates when the primary owner is unavailable.

Clearly separating these responsibilities helps an organization use managed cybersecurity services as part of a broader incident response model rather than treating the provider relationship as an isolated security function.

Build escalation paths around scenarios

A useful escalation plan needs more than a contact list. It should map realistic incident scenarios to specific responsibilities, authority, communication channels, and expected response times.

For common scenarios such as compromised credentials, ransomware, cloud account abuse, suspected data exfiltration, or malware on a critical server, teams can document:

• Trigger: What evidence or severity initiates escalation?

• Investigator: Who validates the activity and determines scope?

• Decision-maker: Who has authority to approve containment?

• Executor: Who performs the technical action?

• Communicator: Who coordinates with IT and other stakeholders?

• Fallback: Who assumes responsibility if the primary contact is unavailable?

• Time threshold: How long should the process wait for a decision before moving to the next escalation point?

The framework should be documented in incident response plans and playbooks, then be tested through tabletop exercises and operational reviews. Exercises can reveal outdated contact information, unclear approval authority, after-hours communication gaps, or technical actions that cannot be executed as expected. Real incidents can provide another feedback loop. If responders repeatedly lose time identifying an application owner or securing approval for containment, that friction points to a process that needs refinement.

This approach also acknowledges that the handoff is rarely a single moment. Investigation, containment, recovery, and communication may pass between an MSSP, the internal security team, IT, and business stakeholders several times over the course of one incident.

The larger challenge is not simply transferring responsibility from an MSSP to a customer. It is transitioning from a technical finding to the business decisions that follow. An MSSP may identify a compromised account, active ransomware, or suspected data exfiltration, but decisions about containment, recovery, communications, legal obligations, and operational risk ultimately belong to the organization.

Effective managed cybersecurity services depend on those transitions being deliberate. By defining who investigates, who contains, who communicates, and who decides, organizations can connect external security expertise with internal authority and business context.

An incident should put an escalation plan into action, rather than expose where one was missing.

LevelBlue helps organizations define these responsibilities before an incident tests them, through incident response planning and tabletop exercises that pressure-test escalation paths with both internal teams and their security providers.

Source: Jess Burn, Jeff Pollard, Joseph Blankenship, Liam Holloway, and Michael Belden, "Best Practices for MDR-to-IR Handoffs," Forrester Research, March 13, 2026.

Contributions by Kenneth Ng, Director of Operational Intelligence at LevelBlue.