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Browser Security Posture Analysis: A Client-Side Security Assessment Framework

Avihay Cohen

TL;DR

The paper tackles the problem that enterprise browser security is insufficiently observed by network- or OS-centric tools, given the browser’s role as a primary work environment. It proposes a self-contained Browser Security Posture Analysis Framework that runs entirely in the browser (JavaScript/WebAssembly) and executes over 120 targeted tests to assess policy enforcement, runtime behavior, and internal browser invariants. Its contributions include a modular in-browser architecture, a comprehensive suite of tests (covering SOP, CORS, CSP, XSS protections, sandboxing, permissions, cryptography, SAB gating, internal network access, and more), an AI-assisted in-browser analysis stage, and enterprise-oriented insights such as policy verification and SIEM-ready reporting. The results demonstrate robust core security in modern browsers but reveal notable gaps in unmanaged consumer configurations, underscoring the need for enforced enterprise controls and ongoing posture monitoring. Overall, the framework provides a practical, privacy-preserving tool for continuous browser hardening, policy validation, and proactive risk management within enterprise environments.

Abstract

Modern web browsers have effectively become the new operating system for business applications, yet their security posture is often under-scrutinized. This paper presents a novel, comprehensive Browser Security Posture Analysis Framework[1], a browser-based client-side security assessment toolkit that runs entirely in JavaScript and WebAssembly within the browser. It performs a battery of over 120 in-browser security tests in situ, providing fine-grained diagnostics of security policies and features that network-level or os-level tools cannot observe. This yields insights into how well a browser enforces critical client-side security invariants. We detail the motivation for such a framework, describe its architecture and implementation, and dive into the technical design of numerous test modules (covering the same-origin policy, cross-origin resource sharing, content security policy, sandboxing, XSS protection, extension interference via WeakRefs, permissions audits, garbage collection behavior, cryptographic APIs, SSL certificate validation, advanced web platform security features like SharedArrayBuffer, Content filtering controls ,and internal network accessibility). We then present an experimental evaluation across different browsers and enterprise scenarios, highlighting gaps in legacy browsers and common misconfigurations. Finally, we discuss the security and privacy implications of our findings, compare with related work in browser security and enterprise endpoint solutions, and outline future enhancements such as real-time posture monitoring and SIEM integration.

Browser Security Posture Analysis: A Client-Side Security Assessment Framework

TL;DR

The paper tackles the problem that enterprise browser security is insufficiently observed by network- or OS-centric tools, given the browser’s role as a primary work environment. It proposes a self-contained Browser Security Posture Analysis Framework that runs entirely in the browser (JavaScript/WebAssembly) and executes over 120 targeted tests to assess policy enforcement, runtime behavior, and internal browser invariants. Its contributions include a modular in-browser architecture, a comprehensive suite of tests (covering SOP, CORS, CSP, XSS protections, sandboxing, permissions, cryptography, SAB gating, internal network access, and more), an AI-assisted in-browser analysis stage, and enterprise-oriented insights such as policy verification and SIEM-ready reporting. The results demonstrate robust core security in modern browsers but reveal notable gaps in unmanaged consumer configurations, underscoring the need for enforced enterprise controls and ongoing posture monitoring. Overall, the framework provides a practical, privacy-preserving tool for continuous browser hardening, policy validation, and proactive risk management within enterprise environments.

Abstract

Modern web browsers have effectively become the new operating system for business applications, yet their security posture is often under-scrutinized. This paper presents a novel, comprehensive Browser Security Posture Analysis Framework[1], a browser-based client-side security assessment toolkit that runs entirely in JavaScript and WebAssembly within the browser. It performs a battery of over 120 in-browser security tests in situ, providing fine-grained diagnostics of security policies and features that network-level or os-level tools cannot observe. This yields insights into how well a browser enforces critical client-side security invariants. We detail the motivation for such a framework, describe its architecture and implementation, and dive into the technical design of numerous test modules (covering the same-origin policy, cross-origin resource sharing, content security policy, sandboxing, XSS protection, extension interference via WeakRefs, permissions audits, garbage collection behavior, cryptographic APIs, SSL certificate validation, advanced web platform security features like SharedArrayBuffer, Content filtering controls ,and internal network accessibility). We then present an experimental evaluation across different browsers and enterprise scenarios, highlighting gaps in legacy browsers and common misconfigurations. Finally, we discuss the security and privacy implications of our findings, compare with related work in browser security and enterprise endpoint solutions, and outline future enhancements such as real-time posture monitoring and SIEM integration.
Paper Structure (50 sections, 3 figures, 1 table)

This paper contains 50 sections, 3 figures, 1 table.

Table of Contents

  1. Introduction
  2. Motivation and Requirements
  3. Framework Overview
  4. Architecture
  5. Implementation
  6. Security Considerations
  7. Test Modules and Technical Details
  8. Same-Origin Policy (SOP) and CORS Enforcement
  9. Same-Origin Policy (SOP):
  10. Cross-Origin Resource Sharing (CORS):
  11. Content Security Policy and XSS Protections
  12. Content Security Policy (CSP):
  13. XSS Filter Protections:
  14. Sandbox Escape Testing
  15. External Interference via WeakRefs (DOM Object Leak Test)
  16. ...and 35 more sections

Figures (3)

  • Figure 1: Overview of the Browser Security Posturebrowser_security_framework framework architecture and components. The in-browser agent executes a series of test modules and aggregates results for reporting.
  • Figure 2: Browser Security Posture UI
  • Figure 3: Number of successful tests per browser out of a distilled subset of 25 test cases. These represent a selected portion of the full test suite. The chart compares browser performance by showing how many of these selected tests each browser passed successfully.