CVE-2026-8435
Received Received - Intake
Cross-Site Request Forgery in Concrete CMS

Publication date: 2026-05-21

Last updated on: 2026-05-22

Assigner: ConcreteCMS

Description
Concrete CMS 9 before 9.5.0 is vulnerable to Cross Site Request Forgery (CSRF) at concrete/controllers/backend/file approveVersion(). 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.
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Meta Information
Published
2026-05-21
Last Modified
2026-05-22
Generated
2026-06-11
AI Q&A
2026-05-22
EPSS Evaluated
2026-06-10
NVD
CVE-2026-8435
EUVD
EUVD-2026-31363
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
concretecms concrete_cms From 9.0 (inc) to 9.5.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-1275 The SameSite attribute for sensitive cookies is not set, or an insecure value is used.
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.
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Executive Summary

This vulnerability affects Concrete CMS versions before 9.5.0 and is a Cross Site Request Forgery (CSRF) issue located at the approveVersion() function in concrete/controllers/backend/file.

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

An attacker could potentially cause an authenticated user to unknowingly approve file versions within Concrete CMS, leading to unauthorized changes or actions being performed.

However, the CVSS score of 2.3 indicates that the impact is relatively low, with low complexity and requiring user interaction.

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