CVE-2026-103278: Ghost 5.8.0 before 6.34.0 Staff Account Takeover via Admin iframe

Severity: high (CVSS 7.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-01 · updated 2026-10-01
Weakness: CWE-23

Description

Ghost versions 5.8.0 before 6.34.0 contain an input validation vulnerability in the admin iframe that allows attackers to take over staff user accounts. Attackers with content publishing privileges can craft malicious pages that, when visited by active staff users, enable account takeover through improper input validation.

Affected products

TryGhost Ghost: from 5.8.0 before 6.34.0 — fixed in 6.34.0

How to fix

Upgrade to a fixed version: TryGhost Ghost 6.34.0. Check the vendor advisory for mitigations.

References

https://github.com/TryGhost/Ghost/security/advisories/GHSA-5pxf-whwv-g54g
https://www.vulncheck.com/advisories/ghost-5.8.0-before-6.34.0-staff-account-takeover-via-admin-iframe

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