Detections
Analytics

SCA: security update for concrete5/concrete5 (GHSA-645j-cm4x-3xvw)

critical Tenable Cloud Security Plugin ID 443870

Description

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

 - Concrete CMS 9.5.0 and below fails to sanitize path traversal sequences in the
 ptComposerFormLayoutSetControlCustomTemplate field when saving page type composer form layouts. An
 authenticated rogue administrator with composer form editing rights can exploit this to include arbitrary
 readable files on the server. Combined with the file uploader's extension-only validation (which permits
 PHP code in files saved with image extensions like .png), this can result in authenticated remote code
 execution. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 9.4 with vector
 CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H Thanks Yonatan Drori (Tenzai) for
 reporting. (CVE-2026-8134)

Solution

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

See Also

https://github.com/advisories/GHSA-645j-cm4x-3xvw

Plugin Details

Severity: Critical

ID: 443870

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: 57.93

Vendor

Vendor Severity: Critical

CVSS v2

Risk Factor: High

Base Score: 8.3

Temporal Score: 6.1

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

CVSS Score Source: CVE-2026-8134

CVSS v3

Risk Factor: High

Base Score: 7.2

Temporal Score: 6.3

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

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

CVSS v4

Risk Factor: Critical

Base Score: 9.4

Threat Score: 7.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

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-2026-8134

cwe: CWE-23