Detections
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SCA: security update for concrete5/concrete5 (GHSA-pv2v-6w2v-97x6)

high Tenable Self-Hosted Container Security Plugin ID 443867

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 Remote Code Execution due to insecure deserialization
 occurring in the ExpressEntryList block controller. An rogue administrator with privileges to add blocks
 to an area can bypass the intended protection mechanism (_fromCIF === true), which normally restricts
 malicious inputs over form POST requests, by leveraging the REST API functionality. Because the REST API
 parses requests using json_decode(), the string "true" is evaluated as a strict PHP Boolean(true). This
 bypass allows the attacker to inject a malicious serialized payload into the block's filterFields database
 column. The payload will subsequently be executed when the block's data is viewed or edited by an
 administrator leading to complete server takeover (RCE).The Concrete CMS security team gave this
 vulnerability a CVSS v.4.0 score of 8.9 with a vector of
 CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H. Thanks Nguyễn Văn Thiện
 https://github.com/Thien225409 for reporting (CVE-2026-8135)

Solution

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

See Also

https://github.com/advisories/GHSA-pv2v-6w2v-97x6

Plugin Details

Severity: High

ID: 443867

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: High

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-2026-8135

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: High

Base Score: 8.9

Threat Score: 5.9

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:P/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-2026-8135

cwe: CWE-502