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Vulnerability record · CVE-2026-53950 · published 24 June 2026

CVE-2026-53950: Cross-site scripting vulnerability

@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.

7.5 CVSS 3.1 High EPSS 0.35% · top 73.7% CWE-79 · Cross-site scripting Deferred
7.5CVSS 3.1 base score
0.35%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
1References
25 Jun 2026Last modified by NVD

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

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-53950), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.