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Dalfox is an open-source XSS scanner written in Rust, designed for automated vulnerability detection across reflected, stored, and DOM-based XSS vectors. It includes parameter discovery, WAF fingerprinting, multiple output formats, and extensibility via REST API and MCP.
Key facts
Objective fields from the source. Values we can't verify are shown as “Unknown” rather than guessed.
| Field | Value |
|---|---|
| Repository | hahwul/dalfox |
| Owner | hahwul |
| Primary language | Rust |
| License | MIT — OSI-approved |
| Stars | 5.1k |
| Forks | 542 |
| Open issues | 12 |
| Latest release | v3.1.2 (2026-06-27) |
| Last updated | 2026-07-07 |
| Source | https://github.com/hahwul/dalfox |
What dalfox is
A Rust-based security testing tool offering parameter analysis, static analysis, DOM/AST verification, WAF bypass tracking, and payload customization. Supports scan modes for URLs, files, stdin, and raw HTTP; outputs JSON/JSONL/SARIF/Markdown/TOML; includes MCP stdio server and REST API for integration.
Get the dalfox source
Clone the repository and explore it locally.
git clone https://github.com/hahwul/dalfox.gitcd dalfox# follow the project's README for install & configurationNeed it deployed, integrated, or customized instead? DEV.co ships production installs.
Best use cases
Implementation considerations
- Requires Rust build environment or use prebuilt binaries (Linux musl, macOS, standard Linux available); verify binary compatibility with your infrastructure.
- Custom payloads and wordlists can be local or remote; ensure network policy and WAF rules allow outbound requests if using remote sources.
- Configuration via CLI flags or environment variables; no config file format documented—plan for shell script or CI variable management.
- Output formats (JSON, SARIF, Markdown) allow integration with SIEM/ticketing systems; map output fields to your downstream tools before deployment.
- REST API and MCP server modes require additional process management (port binding, lifecycle); ensure proper isolation and credential handling if exposed.
When to avoid it — and what to weigh
- Multi-Vulnerability Type Detection Needed — Dalfox is XSS-focused. If your workflow requires SQL injection, CSRF, or other vulnerability classes, a multi-purpose scanner is more appropriate.
- Windows-First Development Environment — Rust toolchain on Windows is functional but documentation examples emphasize macOS/Linux; cross-platform stability not explicitly discussed.
- Minimal Dependencies or Air-Gapped Deployments — Tool supports remote wordlists and external payloads; if all dependencies must be pre-bundled offline, build and testing effort increases.
- Legacy Application Scanning — XSS detection relies on DOM/AST parsing and parameter analysis suited to modern web apps; behavior on outdated frameworks or frameworks with unconventional parameter handling not documented.
License & commercial use
Licensed under MIT (MIT License), an OSI-approved permissive license. Allows commercial use, modification, and distribution with attribution and warranty disclaimer.
MIT license permits commercial use without fee or special approval. Suitable for commercial security products and services. No proprietary restrictions noted; verify compliance with your legal team for bundling in commercial offerings.
DEV.co evaluation signals
Editorial assessment — not user reviews. Directional, with an explicit confidence level.
| Signal | Assessment |
|---|---|
| Maintenance | Active |
| Documentation | Adequate |
| License clarity | Clear |
| Deployment complexity | Low |
| DEV.co fit | Good |
| Assessment confidence | High |
XSS detection tool; no security audit details, CVE history, or penetration test results provided. Rust reduces memory-safety vulns. Handles external payloads and remote wordlists—validate inputs and restrict network access in air-gapped environments. MCP stdio and REST API expose the scanner; use network segmentation and auth if exposed. v2 branch receives security backports; v3 status requires review. No explicit secure-by-default configuration documented.
Alternatives to consider
Nuclei (ProjectDiscovery)
Multi-purpose vulnerability scanner with XSS templates; larger template library and active commercial backing, but heavier and less XSS-specialized.
XStrike (s0md3v)
Python-based XSS scanner with WAF bypass and DOM detection; lighter-weight alternative with similar feature set, but lower adoption and activity.
OWASP ZAP
Comprehensive web app security scanner including XSS; established, well-documented, and widely trusted in enterprises, but heavier and less focused on automation.
Build on dalfox with DEV.co software developers
Dalfox offers fast, automated XSS detection with flexible output formats and CI/CD integration. Review the installation guide, test on a staging environment, and contact us to discuss integration into your DevSecOps pipeline.
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dalfox FAQ
Can I use Dalfox in a commercial security product?
Does Dalfox detect SQL injection or CSRF?
What is the difference between v2 (Go) and v3 (Rust)?
Can I integrate Dalfox into GitHub Actions or GitLab CI?
Software development & web development with DEV.co
Pairing dalfox with the rest of your stack is where most open-source security projects stall. DEV.co is a software development agency that does the integration work — plus AI development when models are in scope.
Ready to Integrate XSS Scanning into Your Security Workflow?
Dalfox offers fast, automated XSS detection with flexible output formats and CI/CD integration. Review the installation guide, test on a staging environment, and contact us to discuss integration into your DevSecOps pipeline.