Cross-Site Request Forgery in Concrete CMS

Publication date: 2026-05-21

Last updated on: 2026-05-26

Assigner: ConcreteCMS

Description

Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file addFavoriteFolder($id). The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori (Tenzai) for reporting.

CVSS Scores

EPSS 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-2026-8416

EUVD

EUVD-2026-31372

Affected Vendors & Products

Vendor	Product	Version / Range
concretecms	concrete_cms	From 9.0.0 (inc) to 9.5.1 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-352	The web application does not, or cannot, sufficiently verify whether a request was intentionally provided by the user who sent the request, which could have originated from an unauthorized actor.
CWE-1275	The SameSite attribute for sensitive cookies is not set, or an insecure value is used.

Attack-Flow Graph

Executive Summary

This vulnerability affects Concrete CMS versions before 9.5.0 and is a Cross Site Request Forgery (CSRF) issue in the backend file addFavoriteFolder($id) controller. CSRF vulnerabilities allow an attacker to trick a user into performing actions they did not intend to, potentially leading to unauthorized changes or actions within the application.

Impact Analysis

The impact of this vulnerability is relatively low, as indicated by its CVSS score of 2.3. It could allow an attacker to cause a user to add a favorite folder without their consent, which might lead to minor unauthorized changes in the user's account or settings. However, it does not lead to data disclosure, privilege escalation, or system compromise.

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