CVE Watch23 jul 2026

CVE-2026-8421

Concrete CMS 9.5.0 and below contains a CSRF vulnerability in the install_package() method of concrete/controllers/single_page/dashboard/ext

CVSS

8.8

Alto

EPSS

0.2%

KEV

—

Exploit Today

0-100

Publicado: 21 may 2026 · Última mod.: 23 jul 2026 · CWE-352

EPSS · 30d

0.2%EPSS · 30 días0.2%

2026-07-062026-08-02

Descripción técnica

Concrete CMS 9.5.0 and below contains a CSRF vulnerability in the install_package() method of concrete/controllers/single_page/dashboard/extend/install.php. An attacker who can cause an authenticated administrator to visit a crafted page, and who has placed or caused a package to be present under DIR_PACKAGES/<handle>/, can force the installation of that package without any CSRF protection. Package installation executes the package controller's install() method as the web server user, enabling remote code execution. In order to be vulnerable, the victim must be passing canInstallPackages. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 7.5 with vector CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks https://github.com/maru1009 for reporting.

Referencias oficiales

documentation.concretecms.orghttps://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes

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