CVE-2026-105643: Ghost: Stored XSS via Embed Card Previews
Impact
Embed cards in the Ghost editor could be used to bypass the fix for GHSA-8vhf-xxpj-4qrg. Any staff user, including Contributors, could store scripts in post content that ran when another staff user opened the post in the editor, possibly resulting in compromise of that user's admin session.
Self-hosted sites should leave the new security.embedPreviewUrl config option at its default.
Vulnerable versions
This vulnerability is present in Ghost from v6.34.0 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 DONG2209 (Dong Nguyen) and Pedro Pinho for disclosing this vulnerability responsibly.
For more information
If you have any questions or comments about this advisory, email us at security@ghost.org.
Other sources
Ghost is a Node.js content management system. From version 6.34.0 until 6.67.0, embed cards in the Ghost editor could bypass protections against stored cross-site scripting. Any staff user, including Contributors, could store scripts in post content that ran when another staff user opened the post in the editor, potentially compromising that user’s admin session. Self-hosted sites should leave the new security.embedPreviewUrl configuration option at its default value. This issue is fixed in version 6.67.0.
— NVD
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/ghostto a version that resolves this vulnerability.Fixed in 6.67.0 - Upgrade
Upgrade
Ghostto a version that resolves this vulnerability.Fixed in 6.67.0 - Configuration
For self-hosted sites, leave security.embedPreviewUrl at its default value.
Ghost security.embedPreviewUrl = default
Event History
Frequently Asked Questions
Which users can exploit this issue, and who is at risk from it?
Any Ghost staff user, including a Contributor, can store malicious script content in a post. The script executes when another staff user opens that post in the editor, which can expose that user’s admin session.
Are default self-hosted Ghost configurations affected?
Self-hosted sites should leave the new security.embedPreviewUrl configuration option at its default value. The provided information does not identify any additional configuration change required for the fix.
Which versions need to be updated?
Ghost versions from 6.34.0 up to, but not including, 6.67.0 are affected. The issue is fixed in version 6.67.0.