Akaunting version 2.1.12 and earlier suffers from an authentication bypass issue in the user-controllable field, companies[0]. This issue was fixed in version 2.1.13 of the product.
Akaunting version 2.1.12 and earlier suffers from a denial-of-service issue that is triggered by setting a malformed 'locale' variable and sending it in an otherwise normal HTTP POST request. This issue was fixed in version 2.1.13 of the product.