CVE-2026-56384CWE-862

Craft CMS - Missing Authorization in assets/preview-thumb Endpoint

Medium · published June 21, 2026

CVSS v4.0
5.3
EPSS
0%
Percentile
25.0
In the wild
Unconfirmed
What it is

Craft CMS contains a missing authorization vulnerability in the assets/preview-thumb endpoint. A Control Panel user without permission to view a target private asset can call the endpoint with an attacker-controlled assetId and receive preview HTML containing a signed fallback transform preview link for that private asset, because no asset-view permission check is performed before preview generation. This affects versions >= 4.0.0-RC1, <= 4.17.7 and >= 5.0.0-RC1, <= 5.9.13, and is fixed in 4.17.8 and 5.9.14.

The record
Technical detail
CVSS v4.0
5.3 · MEDIUM
Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
EPSS
0.00331 · 25.0th percentile
Weakness
CWE-862 · Missing Authorization
Published
2026-06-21T13:27Z
EPSS history
Timeline
  • 21 JUN 13:27Z
    Craft CMS - Missing Authorization in assets/preview-thumb Endpoint
    cvelistv5