CVE-2026-8240
Medium
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.
SeverityMedium
CVSS5.3
Exploit probability—
Product
Concretecms Concrete Cms
PublishedMay 21, 2026
First seenMay 21, 2026
Weakness typeCWE-284Improper access control
How to fix
Update
- concretecms concrete_cms9.5.1 or later
- concrete5/concrete59.5.1 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| concretecms concrete_cms | v < 9.5.1 | 9.5.1 |
| concrete5/concrete5Packagist | v < 9.5.1 | 9.5.1 |
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