A vulnerability in zenml-io/zenml versions 0.57.0 through 0.94.2 allows an attacker to bypass rate-limiting on the "POST /api/v1/login" and self password-change endpoints by rotating the "X-Forwarded-For" header. The rate limiter keys requests by "request.client.host", which is derived from the "X-Forwarded-For" header when Uvicorn is launched with "--proxy-headers --forwarded-allow-ips *". This configuration allows clients to control the value of "request.client.host", effectively bypassing rate-limiting protections. This vulnerability leaves the affected endpoints open to unthrottled credential guessing attacks.