{"document":{"category":"csaf_vex","csaf_version":"2.0","title":"CVE-2026-53950: @tryghost/activitypub: XSS in Ghost's ActivityPub client","publisher":{"category":"vendor","name":"HarborGuard Database","namespace":"https://database.harborguard.co"},"tracking":{"id":"CVE-2026-53950","status":"final","version":"1","initial_release_date":"2026-06-24T18:04:25.695Z","current_release_date":"2026-06-24T18:49:55.010Z","revision_history":[{"date":"2026-06-24T18:04:25.695Z","number":"1","summary":"Initial machine-readable export from HarborGuard."}]},"distribution":{"tlp":{"label":"WHITE"},"text":"Public CVE data; freely redistributable."},"notes":[{"category":"description","text":"@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.","title":"CVE description"}],"references":[{"category":"self","summary":"CVE-2026-53950 on HarborGuard Database","url":"https://database.harborguard.co/cve/CVE-2026-53950"},{"category":"external","summary":"CVE Record","url":"https://www.cve.org/CVERecord?id=CVE-2026-53950"},{"category":"external","summary":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-xpp7-93x6-v29m","url":"https://github.com/TryGhost/Ghost/security/advisories/GHSA-xpp7-93x6-v29m"}]},"product_tree":{"branches":[{"category":"vendor","name":"TryGhost","branches":[{"category":"product_name","name":"Ghost","branches":[{"category":"product_version","name":"< 3.1.0","product":{"name":"TryGhost Ghost < 3.1.0","product_id":"CSAFPID-1","product_identification_helper":{"cpe":"cpe:2.3:a:tryghost:ghost:\\<_3.1.0:*:*:*:*:*:*:*"}}}]}]}]},"vulnerabilities":[{"cve":"CVE-2026-53950","title":"@tryghost/activitypub: XSS in Ghost's ActivityPub client","notes":[{"category":"description","text":"@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.","title":"CVE description"}],"product_status":{"known_affected":["CSAFPID-1"]},"scores":[{"cvss_v3":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H","baseScore":7.5,"baseSeverity":"HIGH"},"products":["CSAFPID-1"]}],"remediations":[{"category":"none_available","details":"No fixed version is published yet. Monitor the upstream advisory.","product_ids":["CSAFPID-1"]}]}]}