FAQ-000457 - Custom Button and JavaScript Security / JavaScript Vulnerability Prevention and DOM Security

The Salesforce DOM refers to the Document Object Model within the Salesforce platform, which represents the structure of web pages and allows scripts to dynamically access and update the content, structure, and style of a page. To avoid JavaScript vulnerabilities in the Salesforce DOM for components like custom buttons and links: 1. **Avoid Executing JavaScript in the Salesforce Domain**: Don't execute JavaScript directly in the Salesforce domain or embed JavaScript directly in custom buttons or links. 2. **Use Secure Frameworks**: Utilize Visualforce, Aura, or Lightning Web Components, which operate within their proper origin and namespace and run JavaScript in a sandboxed environment, ensuring security. 3. **Store JavaScript in Static Resources**: Always store JavaScript code in static resources and load it from there, rather than dynamically loading it from third-party endpoints. 4. **Avoid REQUIRESCRIPT**: Don't use REQUIRESCRIPT or methods like it to inject JavaScript into the Salesforce origin, as this is a security violation and can create security risks. 5. **Use Secure Alternatives**: Replace custom buttons or links with Visualforce buttons or Lightning Web Components to achieve the desired functionality while adhering to security guidelines. By following these practices, you can prevent unauthorized access, maintain a secure Salesforce environment, and ensure your components are secure and compliant.

The FAQ content is accurate and covers the essential points about JavaScript security in the Salesforce DOM. The main improvements made were to adopt a more conversational tone by using contractions ('Don't' instead of 'Do not') to align with the brand guidelines while maintaining all technical accuracy and completeness. No content was outdated or needed substantial revision. Regarding the related security rules selected: 1. **AvoidJavaScriptInUrls** - This rule directly relates to the FAQ's advice about avoiding JavaScript execution in the Salesforce domain, specifically targeting JavaScript in URLs which is mentioned in point 1 about not executing JavaScript directly in custom buttons or links. 2. **AvoidJavaScriptCustomObject** - This rule corresponds to the FAQ's guidance about avoiding JavaScript in custom components, which aligns with the overall theme of not executing JavaScript directly in the Salesforce domain mentioned throughout the answer. 3. **AvoidJavaScriptWebLink** - This rule directly relates to the FAQ's discussion of custom buttons and links, as web links are a specific type of component where JavaScript should be avoided according to point 1 and point 5 of the answer. 4. **AvoidJavaScriptHomePageComponent** - This rule relates to the FAQ's broader guidance about avoiding JavaScript execution in Salesforce components, which supports the recommendation in point 5 to use secure alternatives like Visualforce or Lightning Web Components. 5. **AvoidCreateElementScriptLinkTag** - This rule relates to the FAQ's point 4 about avoiding REQUIRESCRIPT and similar methods that inject JavaScript, as creating script elements dynamically is a similar security concern addressed in the answer.