Cybersecurity Checklist for MSSPs

Managed Security Service Providers (MSSPs) operate across a broad, complex attack surface, simultaneously managing privileged access to multiple client environments while maintaining the security of their own infrastructure. This dual responsibility makes MSSPs valuable targets for attackers who understand that compromising just one MSSP can grant them entry into every client network the provider manages. MSSPs should implement several security measures spanning Identity and Access Management (IAM), endpoint security and incident response procedures.

Here is a structured cybersecurity checklist for MSSPs that provides an auditable framework to help ensure access is applied securely and consistently across internal systems and client environments.

1. Implement a zero-trust security model

Zero-trust security operates under the principle that no user, device or session is implicitly trusted, and every access request must be verified regardless of location. For MSSPs, this framework applies across every layer of operation, from internal staff accessing platforms to technicians overseeing client systems. Each touchpoint expands the organization’s attack surface, and removing implicit trust is essential to maintaining strong security. This is crucial for MSSPs securing multi-tenant environments because without zero-trust controls in place, a compromised credential or unauthorized session may increase risk. Enforcing verification at every access point helps contain this risk and keeps client environments properly isolated from one another.

2. Enforce least-privilege access across all client environments

Least-privilege access means every user, system and application operates with only the permissions necessary to perform a specific function. For MSSPs, where technicians routinely move between client environments, controlling that access is important for protecting against both internal and external risks. In practice, access should be client-specific and temporary. For example, a technician provisioned to perform firewall maintenance for one client should not have standing access to another client’s environment, and access should be revoked immediately after the task is complete.

3. Eliminate insecure credential sharing

Sharing passwords via email or storing them in spreadsheets is one of the most common yet preventable security risks among MSSPs. Credentials handled without proper security controls are vulnerable to interception and leave no audit trail. For MSSPs that manage credentials across many client environments, the potential exposure compounds quickly. Secure, vault-based credential management should replace these practices entirely. Dedicated password managers are built to centralize credential storage, enforce granular access controls and keep a detailed record of who accessed what and when.

4. Secure and manage credentials centrally

As an MSSP adds clients, the number of passwords, service accounts, API keys and privileged credentials it must manage grows quickly. Without a unified system, those credentials can become scattered across client environments, limiting visibility and control. An encrypted, vault-based platform keeps credentials centrally managed and only accessible according to a technician’s role. It also provides auditable permissions and activity, while simplifying technician offboarding and credential rotation.

5. Protect Non-Human Identities (NHIs)

Non-Human Identities (NHIs) like service accounts, tokens and AI agents are some of the most overlooked attack vectors in MSSP environments. Unlike human user accounts, NHIs generally operate without Multi-Factor Authentication (MFA) and often accumulate permissions beyond their original function. One of the most common points of exposure is secrets sprawl, where secrets are embedded directly in code, scripts or configuration files that are shared across teams or forgotten in legacy systems. In an MSSP context, one hardcoded secret in a shared repository can expose multiple clients at once since automation scripts and integrations may be reused across client environments. A centralized secrets manager like Keeper that stores and rotates NHI credentials helps ensure secrets are never stored in plaintext and are subject to the same access controls as human identities.

6. Use JIT access for privileged accounts

Just-in-Time (JIT) access grants elevated permissions only when needed for a specific task, and automatically revokes access once the task is completed. Instead of maintaining standing access indefinitely, JIT access ensures elevated permissions exist only for as long as they are required. For MSSPs, standing access across client infrastructure jeopardizes every client environment. If a technician with standing access to a client’s systems has compromised credentials, that access is immediately available to an attacker. JIT access eliminates that window since each privileged session is provisioned on demand, targets specific systems and expires automatically.

7. Monitor and record all sessions

Privileged session management provides real-time visibility into every privileged session, tracking activity as it happens and maintaining a complete, timestamped recording for auditing purposes. Across a multi-client environment where several technicians may access the same environment during different sessions and timeframes, having full visibility makes accountability enforceable. Detecting suspicious behavior in real time matters as much as having a record after the fact. A session that deviates from expected activity, including accessing systems outside the defined scope or executing unusual commands, can be flagged and terminated before the activity escalates. With real-time session monitoring, every action taken during a privileged session is reviewable and attributable, both internally and to clients who expect transparency.

8. Secure all endpoints across client environments

Every endpoint across every client environment is a potential entry point, and in multi-tenant environments, one misconfigured or unmanaged device on a client network can extend risk beyond that organization. Enforcing consistent device-level controls and security policies across all managed endpoints closes that exposure at scale. Configuration enforcement ensures endpoints across every client environment adhere to a defined security baseline, including encryption standards, application controls and patch levels. With proper endpoint privilege management, MSSPs can enforce least-privilege access on endpoints, elevating specific applications or processes when legitimately required while removing standing admin rights that serve no purpose.

9. Maintain full visibility and audit trails

Across a multi-client environment, knowing who accessed what and when is crucial. Comprehensive audit trails consolidate that visibility into a single record, with every login and permission change attributed to a specific user and timestamp across every managed environment. In incident response, audit trails reduce the time between threat detection and containment. Instead of manually building a timeline from fragmented logs, responders have an immediate, accurate view of what occurred. For compliance, audit trails demonstrate access controls, separation of duties and the integrity of privileged activity, as required by frameworks such as CMMC, GDPR, SOC 2 and HIPAA. MSSPs supporting regulated industries must provide the reporting and security controls their clients need to remain audit-ready.

How Keeper^® helps MSSPs strengthen security

Keeper’s unified identity security platform is designed to address the unique challenges MSSPs face while managing privileged access, credentials and identities across client environments at scale.

Zero-knowledge architecture to support multi-tenant security

One of the most significant threats in multi-tenant environments is the risk of cross-client compromise. Keeper’s zero-knowledge architecture ensures data is encrypted and decrypted at the device level, meaning not even Keeper can access stored data. Keeper also provides a centralized admin console that enforces strict tenant isolation; there is no opportunity for data or access to move between client environments. With Keeper, each tenant stays fully compartmentalized, eliminating the risk of lateral movement that makes MSSPs appealing targets for attackers. 

Password management for secure credential storage

Keeper’s encrypted vault provides a zero-knowledge environment for storing and managing credentials, ensuring passwords are never exposed in plaintext. Secure sharing allows teams to grant credential access without ever exposing the underlying password, making access controlled and revocable. For situations requiring credential sharing with clients or third-party vendors, One-Time Share delivers credentials through a time-limited, encrypted link that expires after a single use. This secure, temporary sharing eliminates the risk of credentials lingering in email or being sent to the wrong recipient, reducing both internal and external exposure.

PAM for JIT access and session management

KeeperPAM^® enforces Role-Based Access Controls (RBAC) that ensure technicians operate only with the permissions their roles and tasks require, scoped per client and automatically revoked after use. JIT provisioning eliminates standing privileges across client infrastructure, limiting the window of opportunity for persistent access to cause harm. KeeperAI^® provides real-time threat detection, flagging suspicious behavior and maintaining a full audit trail across every session to give MSSPs the cross-client visibility and accountability that compliance requires.

Secrets management for protecting NHIs

Keeper Secrets Manager provides secure, centralized storage for NHIs like API keys, service accounts, tokens and machine credentials, effectively removing the need to hardcode secrets in scripts or configuration files. Secrets sprawl across client environments is contained through a centralized management layer with full access controls and built-in rotation capabilities. Native integrations with DevOps workflows and CI/CD pipelines ensure that NHI protection doesn’t create friction for teams while maintaining the same security standards applied to humans.

Endpoint privilege management to enforce least privilege

Keeper Endpoint Privilege Manager (EPM) removes standing local administrative rights across managed endpoints and enforces least-privilege access at the device level. This helps prevent the privilege escalation that attackers rely on to move laterally once inside an environment. Application-level elevation allows specific processes to run with elevated permissions when operationally required, without granting blanket admin access that extends far beyond the intended use case. KeeperEPM also extends governance to agentic AI, controlling who can run agents on an endpoint, what those agents can do on a user’s behalf and how agents request administrative elevation. Across a large client portfolio, EPM is a unified governance layer for both human and machine identities without requiring individualized configuration for each organization.

Improve MSSP security with Keeper

Access control is one of the most important yet most frequently exploited security concerns MSSPs face. Since they are entrusted with privileged access across client environments, MSSPs require structured, consistent and continuously enforced security controls. This checklist serves as a practical guide for MSSPs to evaluate the strength of existing controls and identify potential gaps in least-privilege enforcement, NHI protection and endpoint security. KeeperMSP enables MSSPs to implement these best practices across every client environment from a centralized console without jeopardizing the isolation and accountability each tenant requires.

Start your free trial of KeeperPAM for MSPs to see how Keeper’s unified platform supports the full scope of MSSP security requirements.