CVE-2026-56394 Craft CMS - Authenticated Path Traversal in assets/icon Extension Parameter
Authenticated attackers can read local files via path traversal in the assets/icon extension parameter of 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-2026-56394?
CVE-2026-56394 is a high-severity path traversal 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 from 4.0.0-RC1 contains an authenticated path traversal vulnerability in the assets/icon endpoint where the extension parameter is not validated before file existence checks. Attackers can bypass extension validation by passing traversal sequences that resolve to existing SVG files, allowing local file read access.
Weakness: CWE-22
Which versions are affected by CVE-2026-56394?
4 open source packages ship an affected version, including craftcms/cms.
| Package | Affected | Fixed in |
|---|---|---|
craftcms/cms Packagist | From 4.0.0-RC1 | 4.17.7 |
craftcms/cms Packagist | From 4.0.0-RC1 | 4.17.7 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.9.13 |
craftcms/cms Packagist | From 5.0.0-RC1 | 5.9.13 |
How do I fix CVE-2026-56394?
Upgrade craftcms/cms to a fixed version for your release line: 4.17.7 or 5.9.13.
Upgrade, and resolve every user-supplied path against an allowed base folder before opening it. More about Path traversal.
Is CVE-2026-56394 being exploited?
There is no known exploitation of CVE-2026-56394 in the wild and no public exploit code.
Sources
Also known as GHSA-c43v-4cr8-6mvp.