{"id":"GHSA-xpp7-93x6-v29m","summary":"XSS in Ghost's ActivityPub client","details":"### Impact\n\nThe ActivityPub client in Ghost was vulnerable to JavaScript injection on posts shared by a maliciously customised ActivityPub server.\n\n### Vulnerable Versions\n\nThis vulnerability is present in the @tryghost/activitypub package up to v3.0.8. All prior versions are also affected. \n\n### Patches\n\n@tryghost/activitypub v3.1.0 contains a fix for this issue and is also automatically fetched by Ghost.\n\n### References\n\nGhost thanks Brad Geesaman, Ghost Security for disclosing this vulnerability responsibly. \n\n### For more information\n\nIf you have any questions or comments about this advisory, email Ghost at [security@ghost.org](mailto:security@ghost.org).","aliases":["BIT-ghost-2026-53950","CVE-2026-53950"],"modified":"2026-08-04T22:00:24.156211177Z","published":"2026-08-04T21:54:01Z","database_specific":{"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2026-08-04T21:54:01Z","nvd_published_at":"2026-06-24T19:17:12Z","cwe_ids":["CWE-79"]},"references":[{"type":"WEB","url":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-xpp7-93x6-v29m"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53950"},{"type":"PACKAGE","url":"https://github.com/TryGhost/Ghost"}],"affected":[{"package":{"name":"@tryghost/activitypub","ecosystem":"npm","purl":"pkg:npm/%40tryghost/activitypub"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"3.1.0"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/08/GHSA-xpp7-93x6-v29m/GHSA-xpp7-93x6-v29m.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}