CVE-2026-56384 (GCVE-0-2026-56384)

Vulnerability from cvelistv5 – Published: 2026-06-21 13:27 – Updated: 2026-06-21 13:27
VLAI
Title
Craft CMS - Missing Authorization in assets/preview-thumb Endpoint
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.
Severity
5.3 (Medium)
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
4.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE
Assigner
References
Impacted products
Vendor Product Version
craftcms cms Affected: 4.0.0-RC1 , < 4.17.8 (semver)
Unaffected: 4.17.8 (semver)
Affected: 5.0.0-RC1 , < 5.9.14 (semver)
Unaffected: 5.9.14 (semver)
Create a notification for this product.
Date Public
2026-06-02 00:00
Credits
Susen2
Show details on NVD website
To clipboard 

{
  "containers": {
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        {
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          "packageURL": "pkg:composer/craftcms/cms",
          "product": "cms",
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            },
            {
              "status": "unaffected",
              "version": "4.17.8",
              "versionType": "semver"
            },
            {
              "lessThan": "5.9.14",
              "status": "affected",
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              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.9.14",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
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            {
              "cpeMatch": [
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                  "versionEndExcluding": "4.17.8",
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                  "vulnerable": true
                },
                {
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                }
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          "value": "Susen2"
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      ],
      "datePublic": "2026-06-02T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "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 \u003e= 4.0.0-RC1, \u003c= 4.17.7 and \u003e= 5.0.0-RC1, \u003c= 5.9.13, and is fixed in 4.17.8 and 5.9.14."
        }
      ],
      "metrics": [
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            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
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            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
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            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "LOW",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "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",
            "version": "4.0",
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            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
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            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          },
          "format": "CVSS"
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "Missing Authorization",
              "lang": "en",
              "type": "CWE"
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      "providerMetadata": {
        "dateUpdated": "2026-06-21T13:27:00.378Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
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      "references": [
        {
          "name": "GHSA Advisory GHSA-x76w-8c62-48mg",
          "tags": [
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          "url": "https://github.com/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg"
        },
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        },
        {
          "name": "VulnCheck Advisory: Craft CMS - Missing Authorization in assets/preview-thumb Endpoint",
          "tags": [
            "third-party-advisory"
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          "url": "https://www.vulncheck.com/advisories/craft-cms-missing-authorization-in-assets-preview-thumb-endpoint"
        }
      ],
      "title": "Craft CMS - Missing Authorization in assets/preview-thumb Endpoint",
      "x_generator": {
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      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
    "assignerShortName": "VulnCheck",
    "cveId": "CVE-2026-56384",
    "datePublished": "2026-06-21T13:27:00.378Z",
    "dateReserved": "2026-06-21T02:05:47.495Z",
    "dateUpdated": "2026-06-21T13:27:00.378Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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