CVE-2026-56384 json
Craft CMS - Missing Authorization in assets/preview-thumb Endpoint
published 2026-06-21 4 mo ago modified 2026-11-08 22 h ago also EUVD-2026-38178 , GHSA-x76w-8c62-48mg
- cvss
- 4.3
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 26%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- packagist craftcms/cms 4.17.8, 5.9.14
- craftcms cms 4.17.8, 5.9.14
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.33% chance of exploitation in the next 30 days, higher than 26% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 5.3 | 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 |
| CNA | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N |
| CNA | 4.0 | 5.3 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| packagist | craftcms/cms | >=4.0.0-RC1, <4.17.8 >=5.0.0-RC1, <5.9.14 |
4.17.8 5.9.14 |
Affected products
- craftcms cms
Classification
References
-
github.com
/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27
patch, web
-
github.com
/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg
vendor-advisory, web
-
vulncheck.com
/advisories/craft-cms-missing-authorization-in-assets-preview-thumb-endpoint
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-56384
advisory
-
github.com
/craftcms/cms
package
Sources
- CVE List CVE-2026-56384
- GitHub Advisory GHSA-x76w-8c62-48mg
- NVD CVE-2026-56384
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.