CVE-2026-105643: Ghost: Stored XSS via Embed Card Previews
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Ghostto a version that resolves this vulnerability.Fixed in 6.67.0 - Configuration
Self-hosted sites should 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.