GHSA-83rp-q473-j88c: Input Validation
Impact
An input validation issue may have allowed staff users to access local files outside the intended data storage directories on the server.
Vulnerable versions
This vulnerability is present in Ghost from v6.14.0 up to v6.27.0.
Patches
v6.27.0 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 l3tchupkt and krn0@bugcrowdninja.com for disclosing this vulnerability responsibly.
For more information
If you have any questions or comments about this advisory, email us at security@ghost.org.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/ghostto a version that resolves this vulnerability.Fixed in 6.27.0 - Upgrade
Upgrade
Ghostto a version that resolves this vulnerability.Fixed in 6.27.0
Event History
Frequently Asked Questions
Who can exploit this issue?
Exploitation requires staff-level access to Ghost. It is therefore primarily relevant where staff accounts may be compromised, over-privileged, or accessible to untrusted users.
Which installations need to be updated?
Self-hosted Ghost installations running versions from 6.14.0 through versions before 6.27.0 are affected. Version 6.27.0 contains the fix.
What could an attacker access?
A staff user may be able to access local server files outside Ghost's intended data storage directories. The advisory does not identify specific files or paths that can be accessed.
How should self-hosted deployments remediate this?
Update Ghost to version 6.27.0 or later. Docker-based deployments should update the official Ghost image, while Ghost-CLI installations should use the documented Ghost update process.