CVE-2026-53950 — HIGH (7.5)

Vulnerability 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 Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-79

References

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

FAQ

What is CVE-2026-53950?

CVE-2026-53950 is a vulnerability with a CVSS score of 7.5 (HIGH). @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 Activi...

How severe is CVE-2026-53950?

CVE-2026-53950 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-53950?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.