CVE-2026-8350

Analyzed Analyzed - Analysis Complete

Privilege Escalation in Concrete CMS via Missing Authorization

Publication date: 2026-05-21

Last updated on: 2026-05-26

Assigner: ConcreteCMS

Description

Concrete CMS 9.5.0 and below is vulnerable to missing authorization in the bulk_user_assignment.php which can lead to privilege escalation to Administrative Group. Any authenticated user with access to the bulk user assignment dashboard page can add any user email to any group and can remove legitimate admins. 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:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Vincent55 for reporting.

CVSS Scores

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Meta Information

Published

2026-05-21

Last Modified

2026-05-26

Generated

2026-07-02

AI Q&A

2026-05-22

EPSS Evaluated

2026-06-30

NVD

CVE-2026-8350

Affected Vendors & Products

Vendor	Product	Version / Range
concretecms	concrete_cms	to 9.5.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-863	The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check.

Attack-Flow Graph

Executive Summary

Concrete CMS versions 9.5.0 and below have a vulnerability in the bulk_user_assignment.php component where authorization checks are missing.

This flaw allows any authenticated user who can access the bulk user assignment dashboard page to escalate their privileges.

Specifically, such a user can add any user email to any group, including administrative groups, and can also remove legitimate administrators.

Impact Analysis

The vulnerability can lead to privilege escalation, allowing an attacker with basic authenticated access to gain administrative control.

This means unauthorized users could manipulate user group memberships, potentially removing legitimate admins and adding unauthorized users to privileged groups.

Such unauthorized administrative access can compromise the security and integrity of the CMS, leading to further exploitation or data breaches.

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