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SCA: security update for concrete5/concrete5 (GHSA-prxr-vjgc-2cq9)

high Tenable Cloud Security Plugin ID 443907

Description

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

 - Concrete CMS 9.5.0 and below emits a CSRF token in the local_available_update.php view
 ($token->output('do_update')) but the corresponding do_update() method in
 concrete/controllers/single_page/dashboard/system/update/update.php never calls
 $this->token->validate('do_update'). The form is rendered as a POST form, meaning the token reaches the
 browser, but because the controller discards it without verification, an attacker can craft a cross-site
 POST that triggers a core CMS update to an attacker-specified version string. In order to be vulnerable,
 theictim must be passing canUpgrade()anda valid update version must be present under DIR_CORE_UPDATES. 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-2026-8428)

Solution

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

See Also

https://github.com/advisories/GHSA-prxr-vjgc-2cq9

Plugin Details

Severity: High

ID: 443907

Version: Revision 1.2

Type: Local

Family: SCA Checks

Published: 6/25/2026

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-2026-8428

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-2026-8428

cwe: CWE-352