Vulnerability-Lookup

GHSA-XJ2C-G5XP-4P47

Vulnerability from github – Published: 2026-06-21 15:31 – Updated: 2026-06-21 15:31

Details

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

4.3 (Medium)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-56384"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-862"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-06-21T14:16:26Z",
    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-xj2c-g5xp-4p47",
  "modified": "2026-06-21T15:31:24Z",
  "published": "2026-06-21T15:31:24Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-56384"
    },
    {
      "type": "WEB",
      "url": "https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/craft-cms-missing-authorization-in-assets-preview-thumb-endpoint"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}

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

Vulnerability from cvelistv5 – Published: 2026-06-21 13:27 – Updated: 2026-06-21 13:27

Title

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

Summary

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

CWE-862 - Missing Authorization

Assigner

VulnCheck

References

3 references

URL	Tags
https://github.com/craftcms/cms/security/advisori…	vendor-advisory
https://github.com/craftcms/cms/commit/d30df31122…	patch
https://www.vulncheck.com/advisories/craft-cms-mi…	third-party-advisory

Impacted products

1 product

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)

Date Public

2026-06-02 00:00

Credits

Susen2

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "packageURL": "pkg:composer/craftcms/cms",
          "product": "cms",
          "vendor": "craftcms",
          "versions": [
            {
              "lessThan": "4.17.8",
              "status": "affected",
              "version": "4.0.0-RC1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "4.17.8",
              "versionType": "semver"
            },
            {
              "lessThan": "5.9.14",
              "status": "affected",
              "version": "5.0.0-RC1",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.9.14",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:a:juzaweb:cms:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "4.17.8",
                  "versionStartIncluding": "4.0.0-RC1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:a:juzaweb:cms:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.9.14",
                  "versionStartIncluding": "5.0.0-RC1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "Susen2"
        }
      ],
      "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": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 5.3,
            "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",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "NONE",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "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"
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-862",
              "description": "Missing Authorization",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-21T13:27:00.378Z",
        "orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10",
        "shortName": "VulnCheck"
      },
      "references": [
        {
          "name": "GHSA Advisory GHSA-x76w-8c62-48mg",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://github.com/craftcms/cms/security/advisories/GHSA-x76w-8c62-48mg"
        },
        {
          "name": "https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27",
          "tags": [
            "patch"
          ],
          "url": "https://github.com/craftcms/cms/commit/d30df3112220db1ffd6726a3ed11857014c7fb27"
        },
        {
          "name": "VulnCheck Advisory: Craft CMS - Missing Authorization in assets/preview-thumb Endpoint",
          "tags": [
            "third-party-advisory"
          ],
          "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": {
        "engine": "vulncheck-endgame"
      }
    }
  },
  "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"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-XJ2C-G5XP-4P47

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

Tags

Sightings

Nomenclature