CVE-2026-70593: Ghost: Theme Upload Path Traversal
Impact
A vulnerability in custom themes allowed a staff user to write files outside of the uploads directory. This could be used to alter the behavior of the installation.
Vulnerable versions
This vulnerability is present in Ghost from v0.10.0 up to v6.54.0.
Patches
v6.54.1 contains a fix for this issue.
How to update
For self-hosters using Docker, find Docker's official Ghost image here. Updating a Docker-based Ghost instance is documented here.
If your Ghost is a Ghost-CLI install see our documentation on updating it to the latest version here.
References
Ghost thanks Stephen Sims, Off By One Security for disclosing this vulnerability responsibly.
For more information
If you have any questions or comments about this advisory, email Ghost at security@ghost.org.
Other sources
Ghost is a Node.js content management system. From 0.10.0 until 6.54.1, a vulnerability in custom themes allowed a staff user to write files outside of the uploads directory. This could be used to alter the behavior of the installation through custom theme upload path traversal in LocalStorageBase and theme storage name handling. This issue is fixed in version 6.54.1.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/ghostto a version that resolves this vulnerability.Fixed in 6.54.1 - Upgrade
Upgrade
Ghostto a version that resolves this vulnerability.Fixed in 6.54.1
Event History
Frequently Asked Questions
What is the severity of CVE-2026-70593?
The severity of CVE-2026-70593 is medium with a score of 6.6.
How do I fix CVE-2026-70593?
To fix CVE-2026-70593, upgrade to Ghost version 6.54.1 or later.
What impact does CVE-2026-70593 have on my system?
CVE-2026-70593 allows an attacker to write files outside of the uploads directory, potentially altering the installation's behavior.
Which versions of Ghost are affected by CVE-2026-70593?
Ghost versions from 0.10.0 up to 6.54.0 are affected by CVE-2026-70593.
What type of vulnerability is CVE-2026-70593?
CVE-2026-70593 is classified as a Path Traversal vulnerability.