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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).","state":0,"publishedAt":"2026-08-04T21:54:01+00:00","modifiedAt":"2026-08-04T22:00:24.1562112+00:00","affected":[{"ecosystem":"npm","name":"@tryghost/activitypub","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0"},{"kind":"fixed","version":"3.1.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V3","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"HIGH"}],"references":["https://github.com/TryGhost/Ghost/security/advisories/GHSA-xpp7-93x6-v29m","https://nvd.nist.gov/vuln/detail/CVE-2026-53950","https://github.com/TryGhost/Ghost"],"sourceUrl":"https://github.com/advisories/GHSA-xpp7-93x6-v29m","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-xpp7-93x6-v29m","identifiers":["GHSA-xpp7-93x6-v29m","BIT-ghost-2026-53950","CVE-2026-53950"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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