What is CVE-2026-105643?

CVE-2026-105643 is a high-severity vulnerability in Tryghost Ghost, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2026-10-05.

How severe is CVE-2026-105643?

High severity. CVSS v3 base score is 7.3 out of 10.

XSS in Tryghost Ghost

CVE-2026-105643

Ghost is a Node.js content management system. From version 6.34.0 until 6.67.0, embed cards in the Ghost editor could bypass protections against stored cross-site scripting. Any staff user, including Contributors, could store scripts in post content that ran when another staff user opened the post in the editor, potentially compromising that user’s admin session. Self-hosted sites should leave the new security.embedPreviewUrl configuration option at its default value. This issue is fixed in version 6.67.0.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2026-10-05 · last modified 2026-10-06.

CVSS v3 metric

CVSS v3 base score 7.3 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:N.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Tryghost Ghost — versions >= 6.34.0, < 6.67.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-105643?: CVE-2026-105643 is a high-severity vulnerability in Tryghost Ghost, classified under Cross-site Scripting. CVSS score: 7.3/10. Published 2026-10-05.
How severe is CVE-2026-105643?: High severity. CVSS v3 base score is 7.3 out of 10.