Server-Side Request Forgery (SSRF)
nuxt-api-party is an open source module to proxy API requests. nuxt-api-party attempts to check if the user has passed an absolute URL to prevent the aforementioned attack. This has been recently changed to use the regular expression ^https?://, however this regular expression can be bypassed by an absolute URL with leading whitespace. For example \nhttps://whatever.com which has a leading newline. According to the fetch specification, before a fetch is made …