CVE-2026-105649 Ghost: Stored XSS via SVG Uploads Bypassing Sanitization
Staff users can upload malicious SVGs to execute scripts, potentially compromising admin sessions in Ghost CMS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-105649?
CVE-2026-105649 is a high-severity cross-site scripting vulnerability in TryGhost Ghost, published on 5 Oct 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.
Official description
Ghost is a Node.js content management system. From 4.22.0 until 6.65.0, SVG media thumbnails and SVG images uploaded with a non-SVG file extension were stored without sanitization. This allowed any staff user, including Contributors, to host scripts on the site's domain, possibly resulting in compromise of other staff users' admin sessions. This issue is fixed in version 6.65.0.
Which versions are affected by CVE-2026-105649?
3 open source packages ship an affected version, including ghost.
| Package | Affected | Fixed in |
|---|---|---|
ghost Bitnami | From 4.22.0 | 6.65.0 |
ghost npm | From 4.22.0 | 6.65.0 |
ghost npm | From 4.22.0 | 6.65.0 |
How do I fix CVE-2026-105649?
Upgrade ghost to 6.65.0 or later.
Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.
Is CVE-2026-105649 being exploited?
There is no known exploitation of CVE-2026-105649 in the wild and no public exploit code.
Sources
Also known as BIT-ghost-2026-105649, GHSA-8575-cr6v-7jh4, MINI-9454-c4gg-35q2.