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.
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Meta Information
Published
2026-05-21
Last Modified
2026-05-26
Generated
2026-06-11
AI Q&A
2026-05-22
EPSS Evaluated
2026-06-10
NVD
CVE-2026-8240
EUVD
EUVD-2026-31358
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
concretecms concrete_cms to 9.5.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.
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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.

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.

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