{"id":"BIT-mastodon-2024-37903","summary":"Mastodon has improper authorship check on audience extension for existing posts","details":"Mastodon is a self-hosted, federated microblogging platform. Starting in version 2.6.0 and prior to versions 4.1.18 and 4.2.10, by crafting specific activities, an attacker can extend the audience of a post they do not own to other Mastodon users on a target server, thus gaining access to the contents of a post not intended for them. Versions 4.1.18 and 4.2.10 contain a patch for this issue.","aliases":["CVE-2024-37903","GHSA-xjvf-fm67-4qc3"],"modified":"2026-09-08T08:48:12.921314871Z","published":"2024-07-09T07:24:52.373Z","database_specific":{"severity":"High","cpes":["cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*"]},"references":[{"type":"FIX","url":"https://github.com/mastodon/mastodon/commit/a1c7aae28aecf06659c5b18cfa131b37cd1512a3"},{"type":"FIX","url":"https://github.com/mastodon/mastodon/commit/d4bf22b632ea8b1174375c4966a6768ab66393b6"},{"type":"ARTICLE","url":"https://github.com/mastodon/mastodon/releases/tag/v4.1.18"},{"type":"ARTICLE","url":"https://github.com/mastodon/mastodon/releases/tag/v4.2.10"},{"type":"ADVISORY","url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-xjvf-fm67-4qc3"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-37903"}],"affected":[{"package":{"name":"mastodon","ecosystem":"Bitnami","purl":"pkg:bitnami/mastodon"},"ranges":[{"type":"SEMVER","events":[{"introduced":"2.6.0"},{"fixed":"4.1.18"},{"introduced":"4.2.0"},{"fixed":"4.2.10"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/mastodon/BIT-mastodon-2024-37903.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:N"}]}],"schema_version":"1.9.0"}