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.)

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.

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