CVE-2026-8140

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.

• CWE-352

• https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notesRelease Notes

Published

May 21, 2026

Last Modified

Jul 23, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-8134Concrete CMS 9.5.0 and below fails to sanitize path traversa…7.2
• CVE-2026-8135Concrete CMS 9.5.0 and below is vulnerable to Remote Code Ex…7.2
• CVE-2026-8136A flaw has been found in SourceCodester Pharmacy Sales and I…2.4
• CVE-2026-8137A vulnerability has been found in Totolink X5000R 9.1.0u.636…8.8
• CVE-2026-8138A vulnerability was found in Tenda CX12L 16.03.53.12. This i…8.8
• CVE-2026-8139Concrete CMS 9.5.0 and below is vulnerable to Stored XSS via…5.4
• CVE-2026-8141The Ajax Load More - Filters plugin for WordPress is vulnera…7.2
• CVE-2026-8142VINCE versions 3.0.38 and earlier do not properly verify the…6.5
• CVE-2026-8143The HBook plugin for WordPress is vulnerable to Stored Cross…7.2
• CVE-2026-8144GitLab has remediated an issue in GitLab CE/EE affecting all…4.3
• CVE-2026-8147In MLflow versions prior to 3.14.0, when running with authen…8.1
• CVE-2026-8148NAVER MYBOX Explorer for Windows before 3.0.11.160 allows a …7.8