High severity · published Jun 24, 2026
CVE-2026-53950
@tryghost/activitypub: XSS in Ghost's ActivityPub client
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
High
Privileges
None
User interaction
Required
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 29% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
GH
Ghost · TryGhost
< 3.1.0 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-53950
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-53950
github.com
https://github.com/TryGhost/Ghost/security/advisories/GHSA-xpp7-93x6-v29m
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