i18next is a language translation framework. Because of how the interpolation is implemented, making replacements from the dictionary one at a time, untrusted user input can use the name of one of the dictionary keys to inject script into the browser. This affects i18next <=1.10.2.
https://github.com/advisories/GHSA-f89g-whpf-6q9m
https://nodesecurity.io/advisories/325