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/dialog/page/bulk/design. 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-2026-8413

EUVD

EUVD-2026-31375

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 is a Cross Site Request Forgery (CSRF) issue found in Concrete CMS versions before 9.5.0. It occurs specifically at the path concrete/controllers/dialog/page/bulk/design. CSRF vulnerabilities allow an attacker to trick a user into performing actions on a web application in which they are authenticated, without their consent.

Impact Analysis

The impact of this vulnerability is relatively low, as indicated by the CVSS score of 2.3. It requires user interaction (UI:P) and allows an attacker to perform limited actions (VI:L) without privileges (PR:N). An attacker could potentially cause a user to unknowingly perform certain design-related bulk page actions within Concrete CMS, which might lead to minor disruptions or unauthorized changes.

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