in OpenHarmony v4.0.0 and prior versions allow a remote attacker arbitrary code execution in pre-installed apps through use after free.
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The DNA test for websites.

Learn to secure the web one step at a time, with our practical, interactive learning materials. Covering the latest research, and completely free.

Website scanner for suspicious and malicious URLs

Whether you've just started your hacker journey or you're just looking for some new challenges, the Hacker101 CTF has something for you.

A community for sharing and discussing novel web security research.

The Mozilla Observatory has helped over 240,000 websites by teaching developers, system administrators, and security professionals how to configure their sites safely and securely.

Web Application Security Researcher

The issue tracker for Firefox and other Mozilla products.

Latest web security & vulnerabilities, product releases, product docs and faq blogs.

Websites contain several different types of information. Some of it is non-sensitive, for example the copy shown on the public pages. Some of it is sensitive, for example customer usernames, passwords, and banking information, or internal algorithms and private product information.