A cross-site request forgery flaw was found in etcd 3.3.1 and earlier. An attacker can set up a website that tries to send a POST request to the etcd server and modify a key. Adding a key is done with PUT so it is theoretically safe (can't PUT from an HTML form or such) but POST allows creating in-order keys that an attacker can send.
- https://github.com/coreos/etcd/issues/9353
- https://github.com/andir/nixos-issue-db-example
- https://github.com/asa1997/topgear_test
- https://github.com/sonatype-nexus-community/nancy