CVE-2026-56394: Craft CMS CMS

Medium severity, CVSS 6.5. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Craft CMS CMS: from 4.0.0-RC1, before 4.17.7 (fixed in 4.17.7); from 5.0.0-RC1, before 5.9.13 (fixed in 5.9.13)

Published 2026-06-21. Last modified 2026-06-23.