CVE-2026-70593

Ghost: Theme Upload Path Traversal

Vulnerable versions

This vulnerability is present in Ghost from v0.10.0 up to v6.54.0.

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 [email protected].

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.

Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files. Typical impact: unauthorized file read or write outside the intended directory.

CVE-2026-70593 has a CVSS score of 6.6 (Medium). The vector is network-reachable, high privileges required, and no user interaction. A CVSS score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether this affects your application depends on whether the vulnerable code is present and reachable in your environment. A fixed version is available (6.54.1); upgrading removes the vulnerable code path.

Kodem intelligence

Already deployed Kodem?

v6.54.1 contains a fix for this issue.

1. What is CVE-2026-70593? CVE-2026-70593 is a medium-severity path traversal vulnerability in ghost (npm), affecting versions >= 0.10.0, < 6.54.1. It is fixed in 6.54.1. Input manipulates file paths to reach files outside the intended directory, such as configuration or credential files.
2. How severe is CVE-2026-70593? CVE-2026-70593 has a CVSS score of 6.6 (Medium). This score reflects the worst-case severity of the vulnerability, not your specific exposure. Whether it represents real risk in your environment depends on whether the vulnerable code is present and reachable.
3. Which versions of ghost are affected by CVE-2026-70593? ghost (npm) versions >= 0.10.0, < 6.54.1 is affected.
4. Is there a fix for CVE-2026-70593? Yes. CVE-2026-70593 is fixed in 6.54.1. Upgrade to this version or later.
5. Is CVE-2026-70593 exploitable, and should I be worried? Whether CVE-2026-70593 is exploitable in your environment depends on whether the vulnerable code is present and reachable. A CVSS score is a worst-case rating; it does not account for your specific deployment, configuration, or usage patterns. Kodem, an Intelligent Application Security platform, uses runtime intelligence to show which vulnerabilities actually execute in production, so you can focus on the ones that represent real risk. Get a demo
6. What actually determines whether CVE-2026-70593 is exploitable, and how bad it is? Exploitability and impact are not fixed properties of a CVE. They depend on runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A high CVSS score on a dependency that never runs is not the same as real risk. Kodem, an Intelligent Application Security platform, uses runtime intelligence to reveal which vulnerabilities actually execute in production, so teams prioritize the ones that genuinely matter.
7. How do I fix CVE-2026-70593? Upgrade ghost to 6.54.1 or later.

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