or [click](javascript:alert(1))) and inspect the rendered HTML for unsanitized output."}},{"@type":"Question","name":"What is the best way to prevent Markdown XSS?","acceptedAnswer":{"@type":"Answer","text":"Use a secure parser with output sanitization, disable raw HTML, whitelist allowed tags, and use DOMPurify or similar libraries."}},{"@type":"Question","name":"Is GitHub vulnerable to Markdown XSS today?","acceptedAnswer":{"@type":"Answer","text":"GitHub uses very strict sanitization, but researchers occasionally find bypasses. Always treat user-submitted markdown as potentially dangerous."}},{"@type":"Question","name":"What tools can help find Markdown XSS?","acceptedAnswer":{"@type":"Answer","text":"Burp Suite, OWASP ZAP, and custom scripts that submit payloads. Use the OWASP XSS Filter Evasion Cheat Sheet for new ideas."}},{"@type":"Question","name":"Can Content Security Policy block Markdown XSS?","acceptedAnswer":{"@type":"Answer","text":"CSP can block inline scripts but not all payloads (e.g., event handlers may still execute). Use CSP as part of a defense-in-depth strategy."}},{"@type":"Question","name":"What are real-world examples of Markdown XSS?","acceptedAnswer":{"@type":"Answer","text":"Notable examples include GitHub README injection (2014), Discourse forum attacks (2015), and Reddit's legacy parser bypasses."}},{"@type":"Question","name":"Is Markdown XSS only a web vulnerability?","acceptedAnswer":{"@type":"Answer","text":"Primarily, but any app that renders markdown to HTML (Electron, mobile WebViews) can be affected if not properly sandboxed."}},{"@type":"Question","name":"How can I practice Markdown XSS attack and defense?","acceptedAnswer":{"@type":"Answer","text":"Set up a local lab with a vulnerable parser (e.g., old marked version) or try CTF challenges that feature markdown injection."}},{"@type":"Question","name":"What should a developer do if they find a Markdown XSS in their app?","acceptedAnswer":{"@type":"Answer","text":"Disable the vulnerable feature immediately, apply a sanitizer like DOMPurify on the rendered output, and update the parser to a secure version."}},{"@type":"Question","name":"Are there automated scanners for Markdown XSS?","acceptedAnswer":{"@type":"Answer","text":"Yes, Burp Suite with custom payloads, and tools like gitleaks for scanning repos. But manual testing often finds edge cases."}}]}
Loading

Loading module…