CVE-2026-8140

The record

Concrete CMS 9.5.0 and below does not validate a CSRF token before processing requests to /dashboard/extend/install/download/<remoteId>. The download() method in concrete/controllers/single_page/dashboard/extend/install.php checks only the canInstallPackages() permission before fetching a remote marketplace package and writing it to the server's DIR_PACKAGES directory. Because the endpoint is a state-changing GET route with no token enforcement, an attacker who can cause an authenticated administrator to visit a crafted page can force an arbitrary marketplace package to be downloaded. In order to be vulnerable, the victim must be passing canInstallPackages() and the site must be connected to the Concrete marketplace. 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.

Affected packages

Related vulnerabilities

• CVE-2026-96388 Cross-Site Request Forgery (CSRF) vulnerability in Drupal Tawk.to - Live chat application… CWE-352
• CVE-2026-96374 Cross-Site Request Forgery (CSRF) vulnerability in Drupal Project Browser allows Cross… CWE-352
• CVE-2026-114719 Roundcube Webmail before 1.6.20 and 1.7.x before 1.7.5 is affected by a CSRF validation… CWE-352
• CVE-2026-114662 Obot before 0.26.0 contains an authentication bypass vulnerability in the CLI login flow… CWE-352
• CVE-2026-111883 Locust through 2.46.7 contains a cross-site request forgery vulnerability that allows… CWE-352
• CVE-2026-62139 Unauthenticated Cross Site Request Forgery (CSRF) in Site Kit by Google <= 1.186.0… CWE-352
• CVE-2026-62133 Subscriber Cross Site Request Forgery (CSRF) in RTMKit <= 2.1.5 versions. CWE-352
• CVE-2026-89245 WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 contains a cross-site… CWE-352