CVE-2026-53950 | THREATINT

Description

@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 Reserved 2026-06-11 | Published 2026-06-24 | Updated 2026-06-24 | Assigner GitHub_M

HIGH: 7.5CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

< 3.1.0

affected

References

github.com/.../Ghost/security/advisories/GHSA-xpp7-93x6-v29m

cve.org (CVE-2026-53950)

nvd.nist.gov (CVE-2026-53950)

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