Manual HTML sanitization detected.

• Rule ID: ruby_lang_manual_html_sanitization
• Languages: ruby
• Source: manual_html_sanitization.yml

Description

Sanitizing HTML manually is error prone and can lead to Cross Site Scripting (XSS) vulnerabilities.

Remediations

❌ Avoid manually escaping HTML:

sanitized_user_input = user.Input
  .gsub('<', '&lt;')
  .gsub('>', '&gt;')
html = "<strong>#{sanitized_user_input}</strong>"

✅ Use a HTML sanitization library:

html = sanitize("<strong>#{user.Input}</strong>")

Resources

• OWASP XSS explained

Associated CWE

• CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

OWASP Top 10

• A03:2021 - Injection