CVE-2026-56385 Craft CMS - Authorization Bypass in assets/preview-file Endpoint
Authenticated low-privileged users can bypass authorization checks to view private asset previews in Craft CMS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-56385?
CVE-2026-56385 is a medium-severity missing authorization vulnerability in craftcms cms, published on 21 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
Craft CMS versions >= 5.0.0-RC1, <= 5.9.13 and >= 4.0.0-RC1, <= 4.17.7 contain an authorization bypass in the assets/preview-file endpoint. The action does not enforce per-asset view authorization before returning preview content, allowing an authenticated low-privileged user to supply a controlled assetId for an asset they are not permitted to view and still receive preview response data (previewHtml), including a private preview image route containing the target private assetId. Fixed in 5.9.14 and 4.17.8.
Weakness: CWE-639
Which versions are affected by CVE-2026-56385?
4 open source packages ship an affected version, including craftcms/cms.
| Package | Affected | Fixed in |
|---|---|---|
craftcms/cms Packagist | From 4.0.0-RC1 | 4.17.8 |
craftcms/cms Packagist | From 4.0.0-RC1 | 4.17.8 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.9.14 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.9.14 |
How do I fix CVE-2026-56385?
Upgrade craftcms/cms to a fixed version for your release line: 4.17.8 or 5.9.14.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-56385 being exploited?
There is no known exploitation of CVE-2026-56385 in the wild and no public exploit code.
Sources
Also known as GHSA-44px-qjjc-xrhq.