FAQ-001098 - Lightning Message Channel Security / IsExposed Configuration and Requirements

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Current FAQ

Question
When is it acceptable to set isExposed=true for Lightning Message Channels, and what are the requirements and risks?
Answer
Setting `isExposed=true` for Lightning Message Channels is acceptable only under specific circumstances: **When Acceptable:** 1. Communication with components across different namespaces is necessary 2. The data being communicated is non-sensitive 3. There is a clear and justified need for integration with other packages 4. Proper approval has been obtained to ensure compliance with security requirements **Requirements:** - Yes, it is generally required to set `isExposed` to `false` for Lightning Message Channels within a package unless there is a specific need to expose it - Exceptions may be considered if the data being communicated is not sensitive - Proper justification and documentation must be provided **Risks of Setting isExposed=true:** - Messages can be sent from untrusted namespaces, leading to potential security vulnerabilities - Unauthorized access or data manipulation becomes possible - Cannot verify the sender's trustworthiness - Increases potential for security breaches **Best Practices:** - Set `isExposed=false` unless absolutely required - Avoid transmitting sensitive data through exposed channels - Implement proper validation mechanisms when exposure is necessary - Document the necessity and provide clear justification during security review **Configuration Meaning:** - When `isExposed=true`: Channel can send/receive messages to/from other namespaces - When `isExposed=false`: Channel is restricted to its own namespace only To minimize risks, always prefer `isExposed=false` and use alternative secure communication methods when possible.

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Related Security Rules (click to view)
AvoidLmcIsExposedTrue
Question
When is it acceptable to set isExposed=true for Lightning Message Channels, and what are the requirements and risks?
Recommended Answer Update
Setting `isExposed=true` for Lightning Message Channels is acceptable only under specific circumstances: **When Acceptable:** 1. Communication with components across different namespaces is necessary 2. The data being communicated is non-sensitive 3. There's a clear and justified need for integration with other packages 4. Proper approval has been obtained to ensure compliance with security requirements **Requirements:** - Yes, it's generally required to set `isExposed` to `false` for Lightning Message Channels within a package unless there's a specific need to expose it - Exceptions may be considered if the data being communicated isn't sensitive - Proper justification and documentation must be provided **Risks of Setting isExposed=true:** - Messages can be sent from untrusted namespaces, leading to potential security vulnerabilities - Unauthorized access or data manipulation becomes possible - Can't verify the sender's trustworthiness - Increases potential for security breaches **Best Practices:** - Set `isExposed=false` unless absolutely required - Avoid transmitting sensitive data through exposed channels - Implement proper validation mechanisms when exposure is necessary - Document the necessity and provide clear justification during security review **Configuration Meaning:** - When `isExposed=true`: Channel can send/receive messages to/from other namespaces - When `isExposed=false`: Channel is restricted to its own namespace only To minimize risks, always prefer `isExposed=false` and use alternative secure communication methods when possible.
Reasoning
The content is accurate and comprehensive, but needed minor improvements for readability and conversational tone. Changes made: 1) Simplified contractions ('There is' → 'There's', 'Cannot' → 'Can't', 'it is' → 'it's') to make the text more conversational and scannable, 2) Streamlined language while preserving all original points and technical accuracy, 3) Maintained the existing structure and level of detail. No outdated content was detected - the information aligns with current Lightning Message Channel security practices. I recommended the AvoidLmcIsExposedTrue rule because this FAQ directly addresses when and how to use the isExposed=true configuration for Lightning Message Channels. The FAQ's core content about setting isExposed=true, the associated security risks (messages from untrusted namespaces, unauthorized access), and the recommendation to prefer isExposed=false directly corresponds to what this security rule is designed to detect and prevent.
Reasoning References