CVE-2026-53950

@tryghost/activitypub: XSS in Ghost's ActivityPub client

State: Published
Severity: 7.5 High
Published: Jun 24, 2026
Updated: Jun 24, 2026
Reserved: Jun 11, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
GhostTryGhost	< 3.1.0Affected

References

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

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