{"id":"BIT-mastodon-2025-27157","summary":"Mastodon's rate-limits are missing on `/auth/setup`","details":"Mastodon is a self-hosted, federated microblogging platform. Starting in version 4.2.0 and prior to versions 4.2.16 and 4.3.4, the rate limits are missing on `/auth/setup`. Without those rate limits, an attacker can craft requests that will send an email to an arbitrary addresses. Versions 4.2.16 and 4.3.4 fix the issue.","aliases":["CVE-2025-27157","GHSA-v39f-c9jj-8w7h"],"modified":"2026-09-08T08:48:12.923483608Z","published":"2025-03-02T07:13:08.797Z","database_specific":{"severity":"Medium","cpes":["cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*"]},"references":[{"type":"FIX","url":"https://github.com/mastodon/mastodon/commit/06f879ce9bea195344ac9f71e6799eea500628ec"},{"type":"ADVISORY","url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-v39f-c9jj-8w7h"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27157"}],"affected":[{"package":{"name":"mastodon","ecosystem":"Bitnami","purl":"pkg:bitnami/mastodon"},"ranges":[{"type":"SEMVER","events":[{"introduced":"4.2.0"},{"fixed":"4.3.4"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/mastodon/BIT-mastodon-2025-27157.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"}]}],"schema_version":"1.9.0"}