CVE-2026-8434
Analyzed Analyzed - Analysis Complete

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 rescanMultiple(). 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:
Percentile:

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-2026-8434
EUVD
EUVD-2026-31366

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
concretecms concrete_cms From 9.0.0 (inc) to 9.5.1 (exc)

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
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

AI Quick Actions

Instant insights powered by AI
Executive Summary

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

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 its CVSS v4.0 base score of 2.3.

An attacker could potentially cause a user to unintentionally trigger the rescanMultiple() function, which may lead to unintended file rescanning operations within Concrete CMS.

However, the vulnerability requires user interaction (UI:P) and does not grant elevated privileges (PR:N), limiting its potential impact.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-8434. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart