HIGHVulnerability
Verified
Global

NVD HIGH: CVE-2026-8421 — Concrete CMS 9.5.0 and below contains a CSRF vulnerability in the install_packag...

·Source: NIST NVD

Updated:

Executive Summary

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/ /, can force the installation of that package without any CSRF protection. Pack

Analysis

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/ /, 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. CVSS Score: 8.8. Published: 2026-05-21T21:16:34.107.

Indicators of Compromise (1)

CVE (1)
CVE-2026-8421
NVDMITRE CVE
Source Attribution

Originally published by NIST NVD on May 21, 2026. Verified by: NIST.

Related Threats

MEDIUMVulnerabilityNEW

EBA and NYDFS ink stablecoin MoU

The European Banking Authority (EBA) has signed a Memorandum of Understanding (MoU) with the New York State Department of Financial Services (NYDFS) under the Markets in Crypto-Assets Regulation (MiCA).

Finextra
MEDIUMVulnerabilityNEW

Affirm BNPL options come to Stripe merchants in the UK

Affirm and Stripe today announced an expanded partnership that will bring Affirm’s pay-over-time solutions to Stripe merchants in the UK for the first time.

Finextra
CRITICALVulnerabilityNEW

NVD CRITICAL: CVE-2026-0611 — Spacelabs Healthcare Sentinel versions 10.5.x and higher and 11.x.x before 11.6....

Spacelabs Healthcare Sentinel versions 10.5.x and higher and 11.x.x before 11.6.0 contain an unauthenticated remote code execution vulnerability through a deprecated .NET Remoting HTTP channel exposed on port 8989 that allows attackers to perform arbitrary file read and write operations by supplying valid .NET URI endpoints. Attackers can write ASPX webshells to the IIS wwwroot directory to achiev

CVE-2026-0611
NIST NVD