description: When "%2F" was present in a manifest URL, Firefox's AppCache behavior may have become confused and allowed a manifest to be served from a subdirectory. This could cause the appcache to be used to service requests for the top level directory. This vulnerability affects Firefox < 78.
problem types: AppCache manifest poisoning due to url encoded character processing
affected:
{
product: Firefox
vendor: Mozilla
versions:
lessThan: 78, status: affected, version: unspecified, versionType: custom
}