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CVE-2026-8421

🗓️ 21 May 2026 20:25:11Reported by ConcreteCMSType 
cve
 cve
🔗 web.nvd.nist.gov👁 7 Views🌐 WEB

CSRF in install_package enables remote code execution in Concrete CMS 9.5.0 and below via crafted page and package.

Related
Detection
Affected
Refs
Paths
NVD
[
  {
    "vendor": "Concrete CMS",
    "product": "Concrete CMS",
    "collectionURL": "https://github.com/concretecms/concretecms",
    "repo": "https://github.com/concretecms/concretecms",
    "versions": [
      {
        "status": "affected",
        "version": "5.0",
        "lessThanOrEqual": "9.5.0",
        "versionType": "git"
      }
    ],
    "defaultStatus": "unaffected"
  }
]
ParameterPositionPathDescriptionCWE
canInstallPackagespathconcrete/controllers/single_page/dashboard/extend/install.phpCSRF in install_package() allows an authenticated admin to trigger package installation without CSRF protection when visiting a crafted page, potentially enabling remote code execution via package install.CWE-352

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