| パッケージ | 影響を受けるバージョン | 修正済みバージョン |
|---|---|---|
| ghost | ≥ 4.0.0, < 6.37.0 | 6.37.0 |
When Ghost is behind a shared caching layer that results in cached content being shared between different visitors (e.g., Fastly, Cloudflare, nginx proxy_cache, and others), an unauthenticated user could send an x-ghost-preview header that altered the rendered frontend response. In affected cache configurations, that response could be stored and served to subsequent visitors requesting the same page, allowing cache poisoning of request-specific preview output.
When running Ghost's frontend and admin panel on the same domain this could be used to take over staff user accounts. When running these on different domains staff accounts have no exposure.
This vulnerability is present in Ghost from v4.0 up to v6.36.0.
v6.37.0 contains a fix for this issue.
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.
If you suspect a credential compromise, use the “Reset all authentication” dialogue under Settings / Danger Zone. This is available starting with Ghost v6.41.0.
At the caching layer, bypass the cache for x-ghost-preview requests.
Ghost thanks CryptoCat for disclosing this vulnerability responsibly.
If you have any questions or comments about this advisory, email us at [email protected].
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