HARDENING BROWSER SECURITY WITH ZERO-TRUST CONTROLS

Summary from the TLDR InfoSec newsletter

This framework outlines six principles for browser-centric zero trust architecture: identity-first access control using federated IdPs, least-privileged access with time-bounded entitlements, continuous verification with adaptive policies, phishing-resistant FIDO2/WebAuthn authentication, device health gating via MDM/EDR integration, and remote browser isolation for high-risk sessions. Implementation follows CISA's Zero Trust Maturity Model through three stages—starting with SSO and passkey MFA, advancing to device compliance enforcement with SCIM automation, and achieving optimal state with per-request access decisions and automated RBI for privileged operations. Security teams should prioritize deploying passkeys to administrators first, integrate IdP conditional access with SIEM/SOAR to automate session revocation, and codify all ZTNA policies as infrastructure-as-code for governance.