SCA: security update for concrete5/concrete5 (GHSA-p8p9-5953-h9jw)

low Tenable Self-Hosted Container Security Plugin ID 443914

Description

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

- Concrete CMS 9.5.0 and below is vulnerable to IDOR in AddMessage/UpdateMessage via attachments[] parameter
which can lead to file permission bypass. The `AddMessage` and `UpdateMessage` conversation controllers
accept user-supplied file attachment IDs and load files directly via `$em->find(File::class,
$attachmentID)` without checking per-file permissions (`canViewFile()`). A user who can post in any
conversation can reference any file in the CMS file manager by its sequential ID, effectively bypassing
the file permission system. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of
2.3 with a vector CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Tristan Mandani
for reporting. if a site truly has private files, the owner should set up a private storage location
https://documentation.concretecms.org/user-guide/editors-reference/dashboard/system-and-
maintenance/files/file-storage-locations outside of the webroot so that permissions can be checked on view
as well. That way, even if a authorized user attaches a file, or otherwise links to it, unauthorized users
won't be able to view the file. (CVE-2026-7886)

Solution

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

Plugin Details

Severity: Low

ID: 443914

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: 57.97

Vendor

Vendor Severity: Low

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

CVSS Score Source: CVE-2026-7886

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/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: Low

Base Score: 2.3

Threat Score: 0.6

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

Exploit Ease: No known exploits are available

Patch Publication Date: 5/22/2026

Vulnerability Publication Date: 5/21/2026

Reference Information

CVE: CVE-2026-7886

cwe: CWE-639

Detections

Analytics