CVE-2026-56385Network attack vector

Private asset preview disclosure via missing authorization

Published Jun 21, 2026 · Updated Jun 21, 2026

Authorization bypass in Craft CMS 4.0.0-RC1 through 4.17.7 and 5.0.0-RC1 through 5.9.13 allows remote authenticated users to read private previews. AssetsController::actionPreviewFile accepts a user-controlled assetId and renders previewHtml without enforcing the asset's volume and peer-volume view permissions. A low-privileged account and an installation containing inaccessible private assets are required; the response exposes preview metadata and a route containing the private asset identifier.

CVSS severity5.3
Medium
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Craft CMS 4.0.0-RC1 through 4.17.7 and 5.0.0-RC1 through 5.9.13 allows remote authenticated users to read private previews. AssetsController::actionPreviewFile accepts a user-controlled assetId and renders previewHtml without enforcing the asset's volume and peer-volume view permissions. A low-privileged account and an installation containing inaccessible private assets are required; the response exposes preview metadata and a route containing the private asset identifier.

The record

CVE
CVE-2026-56385
Published
Jun 21, 2026
Updated
Jun 21, 2026
Vendor
Pixel & Tonic
Product
Craft CMS
Classifications
CWE-639, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.0.0-RC1 <4.17.8
  2. Affected versionversion=5.0.0-RC1 <5.9.14

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Pixel & Tonic · Craft CMSversion=4.0.0-RC1 <4.17.8; version=5.0.0-RC1 <5.9.14

Published CVSS scores

5.3VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
4.3VulnCheckCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1213Data from Information Repositories

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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