What is CVE-2026-105647?

CVE-2026-105647 is a medium-severity vulnerability in Tryghost Ghost, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 4.0/10. Published 2026-10-05.

How severe is CVE-2026-105647?

Medium severity. CVSS v3 base score is 4.0 out of 10.

SSRF in Tryghost Ghost

CVE-2026-105647

Ghost is a Node.js content management system. From 6.54.1 until 6.65.0, a validation issue allowed some functionality, such as Webmentions, to be abused by an unauthenticated user to make limited HTTP requests to hosts in the Ghost server's internal network. A successful attack would not result in any response data being returned. This issue is fixed in version 6.65.0.

Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)

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

CVSS v3 metric

CVSS v3 base score 4.0 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:N/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 >= 6.54.1, < 6.65.0

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-105647?: CVE-2026-105647 is a medium-severity vulnerability in Tryghost Ghost, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 4.0/10. Published 2026-10-05.
How severe is CVE-2026-105647?: Medium severity. CVSS v3 base score is 4.0 out of 10.