{"id":"CVE-2025-27157","aliases":["BIT-mastodon-2025-27157","EUVD-2025-5448","GHSA-v39f-c9jj-8w7h"],"status":"published","title":"Mastodon's rate-limits are missing on `/auth/setup`","description":"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.","severity":{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00369,"percentile":0.31015,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-770"],"published":"2025-02-27T17:12:39Z","modified":"2026-10-28T02:31:10Z","fixes":[{"ecosystem":"Bitnami","package":"mastodon","fixed_in":["4.3.4"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Bitnami","package":"mastodon","ranges":[{"type":"SEMVER","events":[{"introduced":"4.2.0"},{"fixed":"4.3.4"}]}]}],"products":[{"vendor":"joinmastodon","product":"mastodon"},{"vendor":"mastodon","product":"mastodon"}],"references":[{"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-v39f-c9jj-8w7h","tags":["x_refsource_CONFIRM","Vendor Advisory","advisory"]},{"url":"https://github.com/mastodon/mastodon/commit/06f879ce9bea195344ac9f71e6799eea500628ec","tags":["x_refsource_MISC","Patch","fix"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27157","tags":["web","advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27157.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2025-27157","title":"Mastodon's rate-limits are missing on `/auth/setup`","description":"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.","status":"published","published":"2025-02-27T17:12:39.043Z","modified":"2025-02-27T18:10:00.154Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"cna"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:32:42.411662Z"}],"euvd":[{"id":"EUVD-2025-5448","description":"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.","status":"published","published":"2025-02-27T17:12:39Z","modified":"2025-02-27T18:10:00Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"updated_at":"2026-11-02T20:53:21.911964Z"}],"nvd":[{"id":"CVE-2025-27157","description":"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.","status":"published","published":"2025-02-27T17:15:16.867Z","modified":"2026-06-17T09:03:07.113Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"secondary"},{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium","assessor":"primary"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T14:10:52.398004Z"}],"osv":[{"id":"CVE-2025-27157","title":"Mastodon's rate-limits are missing on `/auth/setup`","description":"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.","status":"published","published":"2025-02-27T17:12:39.043Z","modified":"2026-10-28T02:31:10.024594845Z","cvss":[{"version":"3.1","score":5.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","level":"medium"}],"cwes":["CWE-770"],"updated_at":"2026-11-02T15:44:47.386092Z"},{"id":"BIT-mastodon-2025-27157","title":"Mastodon's rate-limits are missing on `/auth/setup`","description":"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.","status":"published","published":"2025-03-02T07:13:08.797Z","modified":"2026-09-08T08:48:12.923483608Z","updated_at":"2026-11-02T15:28:32.645004Z"}]}}