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CVE Vulnerability Details :
CVE-2026-8240
PUBLISHED
More InfoOfficial Page
Assigner-ConcreteCMS
Assigner Org ID-ff5b8ace-8b95-4078-9743-eac1ca5451de
View Known Exploited Vulnerability (KEV) details
Published At-21 May, 2026 | 21:11
Updated At-22 May, 2026 | 13:14
Rejected At-
▼CVE Numbering Authority (CNA)
Concrete CMS 9.5.0 and below is vulnerable to unauthenticated page metadata disclosure in Backend\SummaryTemplate

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.

Affected Products
Vendor
Concrete CMS
Product
Concrete CMS
Collection URL
https://github.com/concretecms/concretecms
Repo
https://github.com/concretecms/concretecms
Default Status
unaffected
Versions
Affected
  • From 5.0 through 9.5.0 (git)
Problem Types
TypeCWE IDDescription
CWECWE-284CWE-284 Improper validation of specified quantity in input
Type: CWE
CWE ID: CWE-284
Description: CWE-284 Improper validation of specified quantity in input
Metrics
VersionBase scoreBase severityVector
4.06.3MEDIUM
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
Version: 4.0
Base score: 6.3
Base severity: MEDIUM
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
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-122CAPEC-122 Privilege Abuse
CAPEC ID: CAPEC-122
Description: CAPEC-122 Privilege Abuse
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Winston Crooker
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
release-notes
Hyperlink: https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
Resource:
release-notes
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Details not found