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 star(). 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

Probability:
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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-2026-8432

EUVD

EUVD-2026-31369

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

CVE-2026-8432 is a vulnerability in Concrete CMS versions before 9.5.0. It is a Cross Site Request Forgery (CSRF) vulnerability located at the concrete/controllers/backend/file star() function. This means that an attacker could trick a user into performing unwanted actions on the Concrete CMS application without their consent.

Impact Analysis

This vulnerability could allow an attacker to perform actions on behalf of an authenticated user without their permission, potentially leading to unauthorized changes or operations within the Concrete CMS application. However, the CVSS score of 2.3 indicates that the impact is relatively low.

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