CVE-2026-70593 TryGhost CVE debrief

Who should care

Users of Ghost versions prior to 6.54.1, especially those with staff users who have access to custom theme uploads, should verify and restrict custom theme upload paths to prevent potential path traversal attacks. This includes operators, platform administrators, vulnerability management teams, and security teams who need to review and mitigate the vulnerability.

Technical summary

A vulnerability in Ghost custom themes allows staff users to write files outside the uploads directory via path traversal in LocalStorageBase and theme storage name handling. This issue is fixed in version 6.54.1. The vulnerability has a CVSS score of 6.6 and a severity of MEDIUM. Affected users should verify and restrict custom theme upload paths to prevent potential path traversal attacks. The vulnerability can be exploited by staff users with access to custom theme uploads, allowing them to alter the behavior of the installation. The CVE record indicates that the vulnerability is fixed in version 6.54.1, and users should update to this version or later to mitigate the vulnerability.

Defensive priority

Staff users with theme upload access should verify and restrict custom theme upload paths to prevent potential path traversal attacks.

Recommended defensive actions

• Verify custom theme upload paths and restrict access to prevent potential path traversal attacks
• Update Ghost to version 6.54.1 or later to fix the vulnerability
• Monitor for suspicious activity related to custom theme uploads
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record indicates a vulnerability in Ghost custom themes allowing staff users to write files outside the uploads directory via path traversal. This issue is fixed in version 6.54.1. Evidence limits suggest that further verification is needed to confirm affected scope and severity. Defenders should verify custom theme upload paths and restrict access to prevent potential path traversal attacks. The CVE record provides limited source detail, so additional defensive tasks are recommended.

Official resources