Answer in brief
CVE-2026-56385 records a Medium severity (CVSS 5.3) vulnerability in Craft CMS - Authorization Bypass in assets/preview-file Endpoint. The current sources do not mark it as known exploited. The current feed maps craftcms/cms (composer), craftcms/cms (composer), craftcms/cms (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps craftcms/cms (composer), craftcms/cms (composer), craftcms/cms (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| craftcms/cmscomposer | >=5.0.0-RC1,<=5.9.13 | 5.9.14 |
| craftcms/cmscomposer | >=4.0.0-RC1,<=4.17.7 | 4.17.8 |
| craftcms/cmsgeneric | >=5.0.0-RC1 <5.9.14 || >=4.0.0-RC1 <4.17.8 | 5.9.14, 4.17.8 |
Published upstream
Jun 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 21, 2026
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.
Quoted source text, attributed separately from HOL analysis.