Seven ways to develop a workable browser security strategy

COMMENTARY: If there’s one security layer that’s gone from the background to the front line in just a few years, it’s the browser. Once a neutral access point, it has evolved into the nerve center for SaaS, collaboration, and increasingly, Generative AI (Gen AI).

Now the primary work interface for most users, it’s also become one of the most vulnerable layers in corporate security. That transformation has made it an ideal target for attackers—and a rising concern for CISOs.

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A recent analysis of browser-based incidents shows how unsanctioned AI tools and browser extensions have become a force multiplier for browser risk: sensitive data can leak via undetected copy/pasting, prompts and insecure extensions, completely bypassing conventional protections. These days, browsers no longer reside on the endpoint, they are the endpoint. Security leaders must adapt accordingly.

Drawing on research from the past year, here’s a practical checklist to help organizations fold browser security into a cohesive, measurable defense strategy.

Gain visibility into browser activity: Start by discovering which browsers employees actually use -- managed, unmanaged, and AI-enabled. Map user activity across SaaS platforms, Gen AI tools, and web apps. Monitor real-time data movements such as uploads or copy/paste actions to detect unsanctioned data sharing. Think of visibility as the first step to managing Shadow IT, Shadow AI, and other unmanaged browser usage that can easily bypass traditional endpoint controls.
Govern AI and extension usage: The explosion of browser extensions and Gen AI assistants has created a parallel supply chain of micro-applications. Without policy guardrails, users can unintentionally connect sensitive corporate data to external LLMs or install extensions with over-permissive access. Maintain clear allow/block lists, enforce periodic reviews, and require risk assessments for both AI tools and browser add-ons.
Strengthen identity and session controls: Browsers often contain both personal and corporate accounts. That convenience creates risk. Enforce SSO and MFA for all browser-based logins, monitor for session hijacking, and restrict the usage of personal identities from handling sensitive corporate data wherever possible. Attackers routinely exploit cookie reuse and identity replay, so continuous validation of session integrity is essential.
Protect data at the point of interaction: Traditional DLP rarely sees what happens inside the browser window. That’s where much of today’s data exposure occurs—through form fills, chat prompts, and file uploads. In-browser data-loss prevention can help classify sensitive content and block risky actions such as entering PII into a public AI model. Extending those controls to unmanaged or BYOD devices closes a major blind spot.
Secure the browser supply chain: Every extension, plugin, and AI agent represents both a dependency and a potential compromise vector. Even well-known extensions have been sold to less reputable developers or quietly updated with malicious code. Conduct ongoing audits, disable auto-installed add-ons, and evaluate developer reputation and update histories. Managing these micro-supply chains is as important as monitoring larger software vendors.
Manage browser risk continuously: Browser security requires continuous upkeep. Configuration drift in cookies, permissions, or settings can expose endpoints to exploitation. Implement continuous monitoring and analytics to flag anomalies -- such as unusual data volumes or unexpected AI interactions -- and automatically adjust policy responses. Adaptive risk scoring helps CISOs stay ahead of threats without overwhelming analysts with static alerts.
Empower users without restricting them: Security programs that rely solely on blocking end up driving users toward workarounds. Educate employees on browser hygiene, AI data risks, and approved tools. Publish a list of sanctioned SaaS and AI services, and encourage open dialogue when teams need new tools. Make “security without disruption” the guiding principle: productivity and protection must evolve together.

The browser has quietly become the operating system of the modern workforce. Every SaaS login, every AI prompt, every shared document passes through it. Treating it as an enterprise asset -- governed, monitored, and continuously assessed -- aligns it with broader frameworks like zero trust and identity governance.

Forward-thinking security teams are already integrating browser telemetry with SIEMs, XDR platforms, and identity systems to create full-stack visibility from user intent to data flow. That’s where the next wave of cyber defense has been headed: we need to turn the browser from a blind spot into a control plane. The sooner CISOs embrace that reality, the faster they can mitigate the risk of unsanctioned tools and protect both sensitive data and the organization’s reputation.

Or Eshed, co-founder and CEO, LayerX Security

SC Media Perspectives columns are written by a trusted community of SC Media cybersecurity subject matter experts. Each contribution has a goal of bringing a unique voice to important cybersecurity topics. Content strives to be of the highest quality, objective and non-commercial.