SB20260814119 - Multiple vulnerabilities in Ghost
Published: August 14, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 3 vulnerabilities.
1) Improper isolation or compartmentalization (CVE-ID: N/A)
CWE-ID: CWE-653 - Improper isolation or compartmentalization
CVSSv4: 8.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to execute untrusted script in a staff user\'s admin session.
The vulnerability exists due to improper isolation or compartmentalization in the oEmbed preview in the Ghost editor when rendering externally hosted scripts. A remote attacker can supply crafted embedded content to execute untrusted script in a staff user\'s admin session.
User interaction is required when a staff user views the crafted oEmbed preview.
2) Relative Path Traversal (CVE-ID: N/A)
CWE-ID: CWE-23 - Relative Path Traversal
CVSSv4: 8.4 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to take over a staff user\'s account.
The vulnerability exists due to relative path traversal in the admin iframe when processing published content. A remote user can publish a malicious page to take over a staff user\'s account.
User interaction is required for an active staff user to visit the malicious page.
3) Insufficient Session Expiration (CVE-ID: N/A)
CWE-ID: CWE-613 - Insufficient Session Expiration
CVSSv4: 7.6 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote user to maintain access to the affected account after a password change.
The vulnerability exists due to insufficient session expiration in Ghost admin when handling password reset and session invalidation. A remote user can use a previously stolen session cookie to maintain access to the affected account after a password change.
Remediation
Install update from vendor's website.