CVE-2026-53950
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product@tryghost/activitypub
PublishedJun 24, 2026
First seenJun 24, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- @tryghost/activitypub3.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| @tryghost/activitypubnpm | v < 3.1.0 | 3.1.0 |
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