CVE-2026-53950: Tryghost Ghost

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

@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.

Affected products

• Tryghost Ghost: before 3.1.0 (fixed in 3.1.0)

Published 2026-06-24. Last modified 2026-06-25.