Summary
Ghost Vulnerable to Remote Code Execution via Malicious Themes
Vulnerable Versions
This vulnerability is present in Ghost v0.7.2 to v6.19.0.
Workarounds
Ghost generally recommends users refrain from installing untrusted themes. If a malicious theme has already been installed, it is recommended to uninstall the theme and then inspect it to understand its impact, which will be attack-specific.
References
Ghost thanks Cristian-Alexandru Staicu at Endor Labs for disclosing this vulnerability responsibly.
For more information
If there are any questions or comments about this advisory, email Ghost at [email protected].
Impact
Specifically crafted malicious themes can execute arbitrary code on the server running Ghost.
CVE-2026-29053 has a CVSS score of 7.6 (High). The vector is network-reachable, high privileges required, and user interaction required. 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 (6.19.1); upgrading removes the vulnerable code path.
Affected versions
Security releases
Kodem intelligence
Severity tells you how bad this could be in the worst case. It does not tell you whether you are exposed. Exploitability and impact are functions of runtime truth: whether the vulnerable code is present, reachable, and actually executes in your application. A vulnerable package can sit in your dependency tree and never run.
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. Kodem's runtime-powered SCA identifies whether this CVE is reachable in your applications.
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v6.19.1 contains a fix for this issue.
Frequently Asked Questions
- What is CVE-2026-29053? CVE-2026-29053 is a high-severity security vulnerability in ghost (npm), affecting versions >= 0.7.2, <= 6.19.0. It is fixed in 6.19.1.
- How severe is CVE-2026-29053? CVE-2026-29053 has a CVSS score of 7.6 (High). 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.
- Which versions of ghost are affected by CVE-2026-29053? ghost (npm) versions >= 0.7.2, <= 6.19.0 is affected.
- Is there a fix for CVE-2026-29053? Yes. CVE-2026-29053 is fixed in 6.19.1. Upgrade to this version or later.
- Is CVE-2026-29053 exploitable, and should I be worried? Whether CVE-2026-29053 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
- What actually determines whether CVE-2026-29053 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.
- How do I fix CVE-2026-29053? Upgrade
ghostto 6.19.1 or later.