{"id":"CVE-2025-62605","url":"https://www.cyber-defence.io/tools/cve/CVE-2025-62605","generatedAt":"2026-10-28T09:42:20.948Z","title":"In Mastodon version 4.4, support for verifiable quote posts with quote controls was added, but it is possible for an attacker to bypass these controls in Mastodon versions prior to 4.4.8 and 4.5.0-beta.2.","description":"Mastodon is a free, open-source social network server based on ActivityPub. In Mastodon version 4.4, support for verifiable quote posts with quote controls was added, but it is possible for an attacker to bypass these controls in Mastodon versions prior to 4.4.8 and 4.5.0-beta.2. Mastodon internally treats reblogs as statuses. Since they were not special-treated, an attacker could reblog any post, then quote their reblog, technically quoting themselves, but having the quote feature a preview of the post they did not get authorization for with all of the affordances that would be otherwise denied by the quote controls. This issue has been patched in versions 4.4.8 and 4.5.0-beta.2.","published":"2025-10-21T17:15:41.000Z","lastModified":"2026-10-19T16:10:00.000Z","status":"Analyzed","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":4.3,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"},"cwe":["CWE-754"],"affected":["joinmastodon/mastodon"],"epss":{"score":0.00286,"percentile":0.20995,"date":"2026-10-27","history":[]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.29%). Track it; it rarely justifies an emergency change on its own."},"changes":[],"references":[{"url":"https://github.com/mastodon/mastodon/commit/2dc4552229b55e2e4adaef675e68ed7ae123d78e","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/mastodon/mastodon/commit/405a49df44033e7d179f3d44d59fb68a67d54789","tags":["Patch"],"source":"security-advisories@github.com"},{"url":"https://github.com/mastodon/mastodon/releases/tag/v4.4.8","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/mastodon/mastodon/releases/tag/v4.5.0-beta.2","tags":["Release Notes"],"source":"security-advisories@github.com"},{"url":"https://github.com/mastodon/mastodon/security/advisories/GHSA-8h43-rcqj-wpc6","tags":["Vendor Advisory"],"source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2025-62605","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}