OWASP ZAP Review 2026
Last updated: May 2026
Featured · Open Source
Free open-source web application security scanner with active scanning and fuzzing.
| Category | Bug Bounty & Offensive Security |
|---|---|
| Pricing | Free/OSS |
| Rating | ★★★★ 4.5 / 5 |
| License | Open Source |
Key Features
- Intercepting proxy for HTTP/HTTPS traffic analysis
- Automated active and passive vulnerability scanning
- Traditional spider and AJAX spider for application crawling
- Fuzzer for parameter brute-forcing and injection testing
- Forced browse for discovering hidden files and directories
- WebSocket testing support
- Scripting engine supporting JavaScript, Python, Ruby, and Groovy
- REST API for CI/CD integration and automation
- 100+ marketplace add-ons
- Report generation in HTML, XML, JSON, and Markdown formats
Detailed Review
OWASP ZAP (Zed Attack Proxy) is the most popular free and open-source web application security scanner in the world, maintained by the Open Worldwide Application Security Project community and a dedicated core team. Originally released in 2010 as a fork of the Paros Proxy project, ZAP has evolved into a full-featured dynamic application security testing (DAST) tool that competes directly with commercial products like Burp Suite Professional. It serves as both an intercepting proxy for manual testing and an automated scanner for discovering vulnerabilities in web applications and APIs.
ZAP operates as a man-in-the-middle proxy that intercepts all HTTP and HTTPS traffic between the tester's browser and the target application. Testers can inspect, modify, and replay requests to understand application behavior and test for security flaws. The automated active scanner tests for hundreds of vulnerability types including SQL injection, cross-site scripting (XSS), path traversal, remote file inclusion, server-side request forgery, and common misconfigurations mapped to the OWASP Top 10. The passive scanner runs continuously during manual browsing, flagging issues like missing security headers, cookie problems, information leakage, and insecure transport configurations without sending additional requests.
A major focus in ZAP's 2025 development cycle was enhancing authentication support, which has historically been one of the biggest challenges for dynamic scanners. The updated authentication framework makes it significantly easier to configure session handling for applications using modern authentication mechanisms like OAuth 2.0, JWT tokens, and multi-factor authentication workflows. The 2025 updates also introduced improvements to the AJAX Spider for better coverage of JavaScript-heavy single-page applications, adopted the WAVSEP benchmark project for continuous scanner accuracy validation, and enhanced API scanning capabilities for OpenAPI, SOAP, and GraphQL endpoints.
ZAP is available as a desktop application for Windows, macOS, and Linux, as a Docker container for CI/CD integration, and as a daemon mode for automated scanning in pipelines. The ZAP Marketplace provides over 100 add-ons for extended functionality including advanced fuzzing, access control testing, custom script-based scan rules, and integration with tools like Jenkins, GitLab CI, GitHub Actions, and Selenium. ZAP supports scripting in JavaScript, Python, Ruby, and Groovy for custom scan rules and automation.
ZAP is entirely free with no paid tiers or premium features, funded by the OWASP Foundation, corporate sponsors, and the open-source community. This makes it the most accessible professional-grade web application security tool available, particularly valuable for startups, students, and organizations that cannot justify the $499 per year cost of Burp Suite Professional.
ZAP is best suited for developers integrating security testing into CI/CD pipelines, security teams performing regular application assessments, students learning web application security, and organizations that need a capable DAST tool without commercial licensing costs. The main limitations compared to Burp Suite are a less polished user interface, fewer manual testing conveniences, a smaller extension ecosystem, and slower scan speeds on large applications. However, ZAP's zero cost, active development, strong community, and CI/CD integration capabilities make it an essential tool in any web application security testing toolkit.
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