In Appwrite CLI before 3.0.0, when using the login command, the credentials of the Appwrite user are stored in a ~/.appwrite/prefs.json file with 0644 as UNIX permissions. Any user of the local system can access those credentials.

The ACME-challenge endpoint in Appwrite 0.5.0 through 0.12.x before 0.12.2 allows remote attackers to read arbitrary local files via ../ directory traversal. In order to be vulnerable, APPSTORAGECERTIFICATES/.well-known/acme-challenge must exist on disk. (This pathname is automatically created if the user chooses to install Let's Encrypt certificates via Appwrite.)

Appwrite is vulnerable to stored cross-site scripting in usernames, function names, storage bucket names, and database collection names.