SCA: security update for concrete5/concrete5 (GHSA-r42c-3rr2-jrfp)

high Tenable Self-Hosted Container Security Plugin ID 443869

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

- 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. (CVE-2026-8140)

Solution

Update the concrete5/concrete5 library and its related packages to version 9.5.1 or later.

Plugin Details

Severity: High

ID: 443869

Version: Revision 1.2

Type: Local

Family: SCA Checks

Published: 6/24/2026

Updated: 7/2/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Low

Score: 3

Percentile: 23.72

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:N

CVSS Score Source: CVE-2026-8140

CVSS v3

Risk Factor: Medium

Base Score: 6.5

Temporal Score: 5.7

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 7.5

Threat Score: 4.8

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/21/2026

Vulnerability Publication Date: 5/21/2026

Reference Information

CVE: CVE-2026-8140

cwe: CWE-352

Detections

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