You are correct that the security of Cisco Incoming Webhooks relies primarily on the secrecy of the webhook URL. However, there are ways to improve the security of your webhook integration.
One way to increase the security of your webhook is to use HTTPS to encrypt the communication between the sender and the webhook. This ensures that the webhook URL and any data transmitted over the network are protected from eavesdropping and interception.
Another way to enhance the security of your webhook is to implement message validation using message signatures. This ensures that the incoming messages are from trusted sources and have not been tampered with during transmission. To use message signatures, you would need to generate a shared secret key and use it to sign outgoing messages. The recipient of the message would then use the same shared secret key to validate the signature and ensure the message's authenticity.
Regarding the security of the webhook URL, it's challenging to quantify the exact difficulty of guessing the URL path without knowing the specific implementation details. However, the webhook URL should be kept confidential and only shared with trusted sources. Additionally, you can use rate limiting and IP address filtering to prevent abuse and limit access to your webhook.
