Auth bypass in Tryghost Ghost
CVE-2026-103266
Ghost versions 5.2.0 through versions prior to 6.62.0 allow a remote attacker, without authentication, to abuse the Stripe Checkout flow to attach a paid subscription to an existing member, modify that member's name, and inject content into newsletters sent to the member. Depending on the recipient's email client, the injected content may be rendered, resulting in HTML injection or cross-site scripting (XSS).
Vulnerability class: Broken Access Control
Published .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/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
Weakness classification (CWE)
References
- github.com/TryGhost/Ghost/security/advisories/GHSA-qppx-rw6v-xjqf (vendor-advisory)
- www.vulncheck.com/advisories/ghost-5.2.0-before-6.62.0-unauthenticated-stripe-c… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-103266?
- CVE-2026-103266 is a high-severity vulnerability in Tryghost Ghost, classified under Incorrect Authorization. CVSS score: 7.1/10. Published 2026-10-01.
- How severe is CVE-2026-103266?
- High severity. CVSS v3 base score is 7.1 out of 10.