{"id":"CVE-2025-27399","summary":"Mastodon's domain blocks & rationales ignore user approval when visibility set as \"users\"","details":"Mastodon is a self-hosted, federated microblogging platform. In versions prior to 4.1.23, 4.2.16, and 4.3.4, when the visibility for domain blocks/reasons is set to \"users\" (localized English string: \"To logged-in users\"), users that are not yet approved can view the block reasons. Instance admins that do not want their domain blocks to be public are impacted. Versions 4.1.23, 4.2.16, and 4.3.4 fix the issue.","aliases":["BIT-mastodon-2025-27399","GHSA-94h4-fj37-c825"],"modified":"2026-08-12T03:51:49.345872867Z","published":"2025-02-27T17:15:05.208Z","database_specific":{"cwe_ids":["CWE-200","CWE-285"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27399.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/mastodon/mastodon/blob/93f0427b8a84faf68d5d02cdf9a26f98fae16f2b/app/controllers/api/v1/instances/domain_blocks_controller.rb#L33-L35"},{"type":"WEB","url":"https://github.com/mastodon/mastodon/blob/93f0427b8a84faf68d5d02cdf9a26f98fae16f2b/app/controllers/api/v1/instances/domain_blocks_controller.rb#L49-L51"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/27xxx/CVE-2025-27399.json"},{"type":"ADVISORY","url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-94h4-fj37-c825"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-27399"},{"type":"FIX","url":"https://github.com/mastodon/mastodon/commit/6b519cfefa93a923b19d0f20c292c7185f8fd5f5"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/mastodon/mastodon","events":[{"introduced":"0"},{"fixed":"378e90f23de89de45a8d7b408124ca8fd5f15050"},{"introduced":"4fcc026f0f1b12a9de21a3af33375a9c8867dd55"},{"fixed":"015858aef749b39e0a0ac662c8022ea0bf23b456"},{"introduced":"ab36c152f9e5f9054798504354365dcaef4e5c43"},{"fixed":"c1f398ae93d23ebb1ff5c7df5a32bc161a632980"},{"fixed":"6b519cfefa93a923b19d0f20c292c7185f8fd5f5"}],"database_specific":{"cpe":"cpe:2.3:a:joinmastodon:mastodon:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"4.1.23"},{"introduced":"4.2.0"},{"fixed":"4.2.16"},{"introduced":"4.3.0"},{"fixed":"4.3.4"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["v4.3.3","v4.1.22","v4.2.15","v4.1.21","v4.2.14","v4.3.2","v4.3.1","v4.3.0","v4.1.20","v4.2.13","v4.3.0-rc.1","v4.2.12","v4.1.19","v4.3.0-beta.2","v4.3.0-beta.1","v4.2.11","v4.1.18","v4.2.10","v4.1.17","v4.2.9","v4.2.8","v4.1.16","v4.1.15","v4.2.7","v4.1.14","v4.2.6","v4.1.13","v4.2.5","v4.1.12","v4.2.4","v4.2.3","v4.1.11","v4.2.2","v4.1.10","v4.2.1","v4.2.0","v4.1.9","v4.1.8","v4.1.7","v4.1.6","v4.1.5","v4.1.4","v4.1.3","v4.1.2","v4.1.1","v4.0.2","v4.1.0","v4.1.0rc3","v4.1.0rc2","v4.1.0rc1","v4.0.1","v4.0.0","v4.0.0rc4","v3.5.3","v4.0.0rc3","v4.0.0rc2","v4.0.0rc1","v3.5.2","v3.5.1","v3.5.0","v3.5.0rc3","v3.5.0rc2","v3.5.0rc1","v3.3.0","v3.4.1","v3.4.0","v3.4.0rc2","v3.4.0rc1","v3.3.0rc3","v3.3.0rc2","v3.3.0rc1","v3.2.0","v3.2.0rc2","v3.2.0rc1","v3.1.4","v3.1.3","v3.1.2","v3.0.1","v3.1.1","v3.1.0","v3.1.0rc2","v3.1.0rc1","v3.0.0","v3.0.0rc3","v3.0.0rc2","v3.0.0rc1","v2.9.2","v2.9.1","v2.9.0","v2.9.0rc2","v2.9.0rc1","v2.8.2","v2.8.1","v2.8.0","v2.8.0rc3","v2.8.0rc2","v2.8.0rc1","v2.7.1","v2.7.0","v2.7.0rc3","v2.7.0rc2","v2.7.0rc1","v2.6.1","v2.6.0","v2.6.0rc4","v2.6.0rc3","v2.6.0rc2","v2.6.0rc1","v2.5.0","v2.5.0rc2","v2.5.0rc1","v2.4.3","v2.4.3rc3","v2.4.3rc2","v2.4.3rc1","v2.4.2","v2.4.2rc3","v2.4.2rc2","v2.4.2rc1","v2.4.1","v2.4.1rc4","v2.4.1rc3","v2.4.1rc2","v2.4.1rc1","v2.4.0","v2.4.0rc5","v2.4.0rc4","v2.4.0rc3","v2.4.0rc2","v2.4.0rc1","v2.3.2","v2.3.2rc5","v2.3.2rc4","v2.3.2rc3","v2.3.2rc2","v2.3.2rc1","v2.3.1","v2.3.1rc3","v2.3.1rc2","v2.3.1rc1","v2.3.0","v2.3.0rc3","v2.3.0rc2","v2.3.0rc1","v2.2.0","v2.2.0rc2","v2.2.0rc1","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.1.0rc6","v2.1.0rc5","v2.1.0rc4","v2.1.0rc3","v2.1.0rc2","v2.1.0rc1","v2.0.0","v2.0.0rc4","v2.0.0rc3","v2.0.0rc2","v2.0.0rc1","v1.6.1","v1.6.0","v1.6.0rc5","v1.6.0rc4","v1.6.0rc3","v1.6.0rc2","v1.6.0rc1","v1.5.1","v1.5.0","v1.5.0rc3","v1.5.0rc2","v1.5.0rc1","v1.4.7","v1.4.6","v1.4.5","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4rc6","v1.4rc5","v1.4rc4","v1.4rc3","v1.4rc2","v1.4rc1","v1.3.2","v1.3.1","v1.3","v1.2.2","v1.2.1","v1.2","v1.1.2","v1.1.1","v1.1","v1.0","v0.9.9","v0.9","v0.8","v0.7","v0.6","v0.1.2","v0.1.1","v0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-27399.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}