Ghost : Stored XSS via SVG Files in Content Imports

Impact

SVG images included in content imports were stored without sanitization. An attacker who convinced an Administrator to import a crafted file could host scripts on the site's domain, possibly resulting in compromise of staff users' admin sessions.

Vulnerable versions

This vulnerability is present in Ghost from v4.0.0 up to v6.65.0.

Patches

v6.67.0 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 Zhixi "Jace" Sun, independent security researcher, for disclosing this vulnerability responsibly.

For more information

If you have any questions or comments about this advisory, email us at [email protected].