In an increasingly AI-powered enterprise landscape, the recent discovery of a zero-click vulnerability in Microsoft 365 Copilot, dubbed EchoLink, should come as a stark warning for cyber security leaders. This isn’t just another flaw – it’s a new class of threat. One that doesn’t require a single click, a download, or any user interaction to trigger. EchoLink is invisible, fast-moving, and capable of silently leaking sensitive enterprise data.

For organizations heavily invested in Microsoft’s productivity suite, EchoLink is a serious red flag. Many rely on Microsoft’s native security tools or try to patch gaps with multiple point solutions. But this fragmented, layered approach can lead to weak links and blind spots, introducing more risk than protection.

EchoLink: A Vulnerability Hiding in Plain Sight

The EchoLink vulnerability exposes how Microsoft 365 Copilot, designed to simplify workflows using AI, can be manipulated to leak user data automatically. The vulnerability does not require any user interaction. Instead, attackers exploit the AI model’s integration points and document handling behavior to extract sensitive corporate information, from meeting summaries to project briefs, all without a click.

The exploit works by embedding prompts within shared documents, calendar invites, or emails that interact with Microsoft 365 Copilot’s AI layer. When the AI processes these prompts, it inadvertently generates and reveals confidential information based on internal organizational context. This all happens in the background without a user knowing – a true zero-click exploit.

While Microsoft patched the vulnerability in June 2025,  EchoLink shouldn’t be viewed as a one-off vulnerability, but rather a sign of things to come. As AI systems become deeply embedded in everyday tools, they will increasingly be targeted by cyber criminals. And most traditional security approaches are not designed to keep up.

Harmony Email & Collaboration Delivers Unified Protection Against Emerging AI Threats

Check Point Harmony Email & Collaboration delivers real-time prevention against phishing, malware, zero-click exploits, and data leaks, including vulnerabilities like EchoLink. Harmony Email & Collaboration is designed to protect cloud-based communication tools like Microsoft 365, Google Workspace, Teams, and Slack. Rather than relying on native tools alone or juggling multiple plug-ins, Harmony Email & Collaboration offers a complete, AI-driven security architecture that works across all communication channels.

Key capabilities include:

  • Advanced AI and ML-based threat detection to spot malicious prompts, payloads, and behavioral anomalies.
  • Zero-click attack prevention, scanning all document interactions, shared file links, and embedded content—before a user ever sees it.
  • Context-aware DLP (Data Loss Prevention) to identify and block unauthorized data extraction or exposure.
  • Unified dashboard and policy management, delivering full visibility and control from a single pane of glass.

When EchoLink-like attacks strike, speed and clarity are everything. Harmony not only prevents threats in real-time, it empowers IT and security teams to act fast and decisively.

GigaOm Names Check Point a Leader in Anti-Phishing for 2025

But don’t just take our word for it. Harmony Email & Collaboration was recognized as both a Leader and Outperformer in the 2025 GigaOm Radar for Anti-Phishing report. The report highlighted Harmony Email & Collaboration’s advanced threat detection, AI-powered prevention capabilities, and seamless integration across collaboration platforms.

This recognition underscores Harmony Email & Collaboration’s ability to go beyond traditional email filters and sandboxing, offering next-gen protection that’s purpose-built for the modern, AI-enabled attack surface.

Native and Layered Approaches Are No Longer Enough

Many organizations incorrectly assume that Microsoft Defender for Office 365 or other built-in tools provide enough coverage.

But recent incidents — including EchoLink — reveal that native tools often fall short when facing highly sophisticated AI-powered, multi-vector attacks. Worse, when companies try to fill these gaps with point solutions, they encounter:

  • Delayed detection and response due to lack of integration.
  • Management overhead from maintaining different vendors and policies.
  • Security gaps created by missed data handoffs between tools.

What’s needed instead is an end-to-end solution with visibility, control, and prevention baked into one platform. With Harmony Email & Collaboration, organizations can move beyond reactive, fragmented defenses and adopt a proactive, unified strategy that adapts as threats evolve.

A Wake-Up Call for Cyber Security Leaders

EchoLink is not just another vulnerability – it’s the canary in the coal mine. It shows how AI is reshaping the threat landscape, creating new exploit paths and exposing enterprises to novel forms of data leakage and manipulation. Cyber leaders should head this important warning and take the steps necessary to fully protect their organizations.

On September 2nd, Check Point’s security experts Roy Rotem and Yoav Shay Daniely hosted a webinar on the anatomy of EchoLink. They explored:

  • How the Microsoft 365 Copilot zero-click vulnerability operates.
  • Why AI-generated threats are hard to detect and block with traditional tools.
  • The dangers of relying on native or disjointed email security solutions.
  • Why the future of email security depends on a complete, prevention-first approach.

Watch the replay here.

Don’t Wait for the Next EchoLink

AI-driven attacks are not hypothetical or theoretical. They’re happening now. And as digital transformation accelerates, the surface area for these attacks only grows.

Check Point Harmony Email & Collaboration gives your organization the protection it needs to prevent not just today’s phishing attempts, but for tomorrow’s AI-enabled threats.

Get a demo and see why Harmony Email & Collaboration is used by over 50,000 enterprises across the globe.

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