Detections
Analytics

SCA: security update for concrete5/concrete5 (GHSA-5rj5-gfmr-hrc3)

high Tenable Self-Hosted Container Security Plugin ID 443886

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/update/prepare_remote_upgrade/<remoteMPID>. An attacker who controls the remote package
 returned for a known marketplace item ID can overwrite the package PHP on disk and force its upgrade()
 method to execute in a single browser navigation. This results in remote code execution as the web server
 user. In order to be vulnerable, the victim must be passing canInstallPackages, victim site must be
 connected to the Concrete marketplace; and the attacker controls the package returned for a marketplace
 item ID already installed on the victim site. 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-2026-8426)

Solution

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

See Also

https://github.com/advisories/GHSA-5rj5-gfmr-hrc3

Plugin Details

Severity: High

ID: 443886

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: Medium

Score: 4.9

Percentile: 57.88

Vendor

Vendor Severity: High

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

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

CVSS Score Source: CVE-2026-8426

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

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

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-2026-8426

cwe: CWE-352