CVE WatchJul 23, 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

High

EPSS

0.2%

KEV

—

Exploit Today

0-100

Published: May 21, 2026 · Last modified: Jul 23, 2026 · CWE-352

EPSS · 30d

0.2%EPSS · 30 days0.2%

2026-07-062026-08-02

Technical description

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.

Official references

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

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