SEPTEMBER 17, 2026
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Case File

CVE-2026-18421

LOW · CVSS 2.1 EPSS 0.24%

Source: NVD + CISA KEV + EPSS · Published 2026-09-15 · Last synced 2026-09-17

CyberRota Analysis

AI-Generated

Concrete CMS versions 9 through 9.5.2 are vulnerable due to inadequate authorization checks in the Boards data source dashboard controller, allowing users with edit permissions on one board to modify or delete data sources of other boards. This could disrupt content feeds and reset custom settings, posing a risk to site integrity. Organizations using affected versions should prioritize remediation to prevent unauthorized access and potential data loss.

CVE
CVE-2026-18421
Severity
LOW
CVSS
2.1
EPSS
0.24%

Original NVD Description

Concrete CMS 9 through 9.5.2 does not perform an authorization check in three actions of the Boards data source dashboard controller (update, update_data_source, and delete_data_source), which resolve a ConfiguredDataSource directly from an attacker-supplied identifier without confirming the requester's edit permission on the owning board. A user granted edit_board_settings on a single board was therefore able to modify or permanently delete the configured data sources of any other board on the site, halting the affected board's content feed and resetting its custom weighting. The CSRF token that guards these actions was validated but bound to the action name rather than to the target object, so a token legitimately obtained for one board could be replayed against another board's ConfiguredDataSource identifier and did not constrain access. 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:L/SC:N/SI:N/SA:N. Thanks Winston Crooker for reporting.