Open-Source Alternatives to Acunetix

Nuclei is a fast, customizable vulnerability scanner based on YAML templates. It allows scanning for vulnerabilities, misconfigurations, exposed panels, and more across multiple protocols including HTTP, DNS, TCP, SSL, and JavaScript. The community maintains thousands of detection templates covering CVEs, default credentials, exposed APIs, and technology fingerprints. Nuclei's template system makes it easy to write custom checks and share them with the community.

Nikto is a classic open-source web server scanner that identifies potentially dangerous files, outdated server software, and version-specific security issues. Written in Perl, it performs comprehensive assessments of web server environments, including CGI scanning and SSL support checks. Nikto's ability to detect a wide range of vulnerabilities makes it a staple tool in web security testing, particularly for legacy systems and environments requiring thorough scrutiny.

sqlmap is an automatic SQL injection and database takeover tool written in Python. It detects and exploits SQL injection vulnerabilities across a variety of database management systems, automating the process of vulnerability identification and exploitation. With its extensive set of features, sqlmap facilitates database fingerprinting, data extraction, and even OS-level command execution, making it a must-have tool for penetration testers and security researchers.

XSStrike is an advanced cross-site scripting (XSS) detection suite that includes a powerful fuzzing engine, context analysis, and WAF detection/bypass capabilities. It automates the process of identifying XSS vulnerabilities by analyzing various contexts and injection points. Written in Python, XSStrike is a go-to tool for security testers looking to identify and exploit XSS vulnerabilities in web applications.

DalFox is a powerful tool for parameter analysis and detecting cross-site scripting (XSS) vulnerabilities. Built in Go, it automates the generation of payloads and supports DOM-based detection techniques, making it suitable for both reflected and stored XSS. The tool's pipeline support allows for seamless integration into testing workflows. DalFox stands out due to its speed and efficiency in identifying complex XSS vectors across various web applications.

Commix is an automated tool for testing web applications for command injection vulnerabilities. It exploits OS command injection flaws by injecting and executing arbitrary commands on the target system. Written in Python, Commix provides a comprehensive suite of features for detecting and exploiting command injection, making it a valuable tool for penetration testers and security researchers.

WPScan is a WordPress security scanner that identifies vulnerabilities by enumerating plugins, themes, and users. It checks for known vulnerabilities in the WordPress core and its components using a regularly updated database. Written in Ruby, WPScan is widely used by security professionals to assess the security posture of WordPress installations and is an essential tool for anyone managing or auditing WordPress sites.

afrog is a fast, low-false-positive vulnerability scanner with a growing library of community-contributed proof-of-concept templates. Written in Go for speed and portability, afrog focuses on practical vulnerability detection — CVEs, default credentials, misconfigurations, and command injection — with templates that verify exploitability rather than just fingerprinting potentially vulnerable versions. The template format is YAML-based (similar to Nuclei) and supports HTTP request/response matching, variable extraction, and multi-step workflows. afrog includes built-in rate limiting, proxy support, and multiple output formats including JSON and HTML reports. What differentiates afrog from Nuclei is its emphasis on reducing false positives through more precise matching conditions and its curated default template set. With over 4,000 GitHub stars and active Chinese and international security community contributions, afrog is gaining adoption as a complementary scanner alongside Nuclei for web vulnerability assessments.