CVE-2026-8240

Analyzed Analyzed - Analysis Complete

Unauthenticated Page Metadata Disclosure in Concrete CMS

Publication date: 2026-05-21

Last updated on: 2026-05-26

Assigner: ConcreteCMS

Description

Concrete CMS 9.5.0 and below is vulnerable to unauthenticated page metadata disclosure across every page with a configured summary template, revealing the existence of private, draft, and restricted pages while leaking title, path, description, and author information. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 6.3 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks Winston Crooker 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-2026-8240

EUVD

EUVD-2026-31358

Affected Vendors & Products

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

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This vulnerability affects Concrete CMS version 9.5.0 and below. It allows unauthenticated users to access page metadata across every page that has a configured summary template. This means that private, draft, and restricted pages can be identified, and sensitive information such as the title, path, description, and author of these pages can be leaked without any authentication.

Impact Analysis

The impact of this vulnerability is that unauthorized individuals can discover the existence of private, draft, and restricted pages on a Concrete CMS site. They can also obtain metadata like titles, paths, descriptions, and author information of these pages. This could lead to information disclosure that might be used for further attacks or to gain insights into the site's structure and content that should remain confidential.

Compliance Impact

The vulnerability in Concrete CMS 9.5.0 and below allows unauthenticated disclosure of page metadata, including private, draft, and restricted pages, along with title, path, description, and author information.

This leakage of potentially sensitive information could impact compliance with data protection regulations such as GDPR and HIPAA, which require protection of private and restricted information from unauthorized access.

However, specific impacts on compliance are not detailed in the provided information.

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