What is CVE-2026-53950?

CVE-2026-53950 is a high-severity vulnerability in Tryghost Ghost, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2026-06-24.

How severe is CVE-2026-53950?

High severity. CVSS v3 base score is 7.5 out of 10.

XSS in Tryghost Ghost

CVE-2026-53950

@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 fix…

Vulnerability class: XSS (Cross-Site Scripting)

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Tryghost Ghost — versions < 3.1.0

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-53950?: CVE-2026-53950 is a high-severity vulnerability in Tryghost Ghost, classified under Cross-site Scripting. CVSS score: 7.5/10. Published 2026-06-24.
How severe is CVE-2026-53950?: High severity. CVSS v3 base score is 7.5 out of 10.