CVE-2026-53950 | @tryghost/activitypub is Ghost’s social/federation client ap… | CVSS 7.5 HIGH

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.

Metadata

CVE ID: CVE-2026-53950
State: PUBLISHED
Assigner: GitHub_M
Reserved: 2026-06-11 15:50 UTC
Published: 2026-06-24 18:04 UTC
Last updated: 2026-06-24 18:49 UTC
Primary CWE: CWE-79
CWE-79: Improper Neutralization of Input During Web Page Gen…
Vendor / Product: TryGhost / Ghost
Sources: cve.org · NVD

Severity & Metrics

7.5 HIGH CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
TryGhost	Ghost	—	< 3.1.0

Weakness (CWE)

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

CVSS scores (1)

Score	Severity	Version	Source	Vector
7.5	HIGH	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H

References (1)

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