The skill does not validate the signature for the incoming requests and is accepting requests with invalid signature specified. Please refer to the document that describes how to build your Alexa Skill as a web service (available via this link: https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/developing-an-alexa-skill-as-a-web-service) for tips and requirements about validating the requests (and their signatures) sent to your web service.
The skill does not validate the signature for the incoming requests and is accepting requests with invalid signature specified. Please refer to the document that describes how to build your Alexa Skill as a web service (available via this link: https://developer.amazon.com/public/solutions/alexa/alexa-skills-kit/docs/developing-an-alexa-skill-as-a-web-service) for tips and requirements about validating the requests (and their signatures) sent to your web service.