How should security teams reduce impersonation risk in real-time communication channels?

Why This Matters for Security Teams

Impersonation in real-time channels is not just a messaging problem. It is an access-control problem that starts the moment a user, vendor, executive, or support agent is believed. Attackers exploit chat, voice, and video because those channels often bypass the stronger checks applied to logins and transactions. Guidance from the NIST Cybersecurity Framework 2.0 is helpful here, but teams still need to translate it into channel-level verification that works under time pressure.

NHIMG research shows why this matters operationally: the State of Non-Human Identity Security reports that only 1.5 out of 10 organisations are highly confident in securing NHIs, which reflects a broader weakness in identity assurance and monitoring. The same trust gap appears in real-time communications when teams rely on caller name, profile image, or message content alone. In practice, many security teams encounter impersonation only after a trusted channel has already been used to request approval, reset access, or redirect money.

How It Works in Practice

Reducing impersonation risk means verifying the interaction with signals that are harder to forge than text, voice, or video. Security teams should combine device telemetry, network context, account history, and behavioral patterns at the first point of contact. That may include confirming whether the endpoint is managed, whether the source network is expected, whether the session timing matches prior behavior, and whether the request is consistent with the person or system being impersonated.

For chat and collaboration tools, this often means pairing identity assertions with risk scoring and policy checks before a sensitive action is allowed. For voice and video, it means treating the channel as insufficient on its own and requiring step-up verification for high-risk requests. The strongest controls usually depend on integration with identity providers, conditional access, and logging so that a suspicious interaction can be flagged before trust is extended. The Top 10 NHI Issues highlights how weak lifecycle controls and poor visibility create openings that impersonation workflows can exploit.

• Use device posture and managed-device checks to distinguish legitimate sessions from lookalikes.
• Correlate network location, time of day, and user behavior before approving sensitive requests.
• Require out-of-band verification for payment changes, credential resets, and privilege escalation.
• Record the evidence behind each trust decision so analysts can review patterns and tune policy.

When the channel supports it, teams should prefer cryptographic proof over presentation cues, such as signed identities or verified session tokens, rather than trusting display names or caller IDs. These controls tend to break down in fragmented collaboration estates where chat, voice, and ticketing systems do not share a common identity backbone, because analysts cannot reliably correlate the same actor across channels.

Common Variations and Edge Cases

Tighter verification often increases friction, requiring organisations to balance user experience against the cost of a successful impersonation. That tradeoff becomes sharper for executives, incident responders, and third-party support desks, where delays can slow legitimate work but weak checks can create a high-value attack path.

Current guidance suggests using risk-based step-up verification for sensitive actions, but there is no universal standard for this yet. Some environments can adopt strict conditional access, while others need a lighter approach for business continuity. Voice deepfakes, guest accounts, and outsourced help desks are especially difficult cases because the attacker may know enough context to sound legitimate while still lacking the device, network, or session history of the real user. For teams building a broader identity program, the Ultimate Guide to NHIs — Why NHI Security Matters Now is a useful reminder that trust failures scale quickly once identity signals are weak.

Most programs also need exception handling for emergency response and executive communications, but those exceptions should be explicit, time-bound, and heavily logged. If a channel cannot support device context, strong session validation, or reliable audit trails, it should not be used for approvals that can change access or move assets.

Related resources from NHI Mgmt Group

• How should security teams combine passwordless access with real-time risk signaling in shared-device environments?
• How do organisations reduce exposure when high-risk activity appears in real time?
• How should security teams use identity observability to reduce access risk in complex enterprises?
• How should security teams reduce identity risk when moving from point products to platform-based security operations?