{"id":"CVE-2026-53950","aliases":["BIT-ghost-2026-53950","GHSA-xpp7-93x6-v29m"],"url":"https://o3.security/vulnerability/CVE-2026-53950","summary":"@tryghost/activitypub: XSS in Ghost's ActivityPub client","details":"@tryghost/activitypub is Ghost’s social/federation client app. Prior to 3.1.0, the ActivityPub client in Ghost was vulnerable to JavaScript injection on posts shared by a maliciously customised ActivityPub server. This vulnerability is fixed in 3.1.0.","published":"2026-06-24T18:04:25.695Z","modified":"2026-08-12T03:51:38.433408357Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"@tryghost/activitypub","fixedVersion":"3.1.0"}],"fix":null,"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53950.json"},{"type":"ADVISORY","url":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-xpp7-93x6-v29m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53950"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:38.433408357Z"}}