Concrete CMS up to 9.5.2 Sitemap Reorder cDisplayOrder privileges management

Summaryinfo

A vulnerability was found in Concrete CMS up to 9.5.2 and classified as problematic. The affected element is the function Concrete\Controller\Backend\Dashboard\SitemapUpdate of the component Sitemap Reorder. Executing a manipulation of the argument cDisplayOrder can lead to privileges management. The identification of this vulnerability is CVE-2026-18425. The attack may be launched remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Concrete CMS up to 9.5.2. It has been declared as problematic. This vulnerability affects the function Concrete\Controller\Backend\Dashboard\SitemapUpdate of the component Sitemap Reorder. The manipulation of the argument cDisplayOrder with an unknown input leads to a privileges management vulnerability. The CWE definition for the vulnerability is CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. As an impact it is known to affect integrity. CVE summarizes:

Concrete CMS 9 before 9.5.3 authorized the dashboard sitemap reorder action (Concrete\Controller\Backend\Dashboard\SitemapUpdate) using only the global access_sitemap task permission and did not check per-page edit permission before updating each page's display order. As a result, an authenticated user granted sitemap access could change the display order (cDisplayOrder) of any pages they had no rights to edit, altering the order in which those pages render in navigation, breadcrumb, and page-list output. The reorder action additionally validated no CSRF token, so the write could be triggered by a forged request. The Concrete CMS security team gave this vulnerability a CVSS v4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.

The advisory is available at documentation.concretecms.org. This vulnerability was named CVE-2026-18425 since 07/30/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are needed for exploitation. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 9.5.3 eliminates this vulnerability.

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Productinfo

Type

• Content Management System

Name

• Concrete CMS

Version

• 9.5.0
• 9.5.1
• 9.5.2

License

• open-source

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CPE 2.2info

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