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GHSA-q9fm-mpg8-8jqm

Concrete CMS is vulnerable to Stored XSS via page name in the Atomik theme

Source: GitHub Advisory Database (reviewed) Low CVE-2026-8353

Packages

EcosystemPackageAffectedFixed in
Packagist concrete5/concrete5 >= 9.0.0RC.1, < 9.5.1 9.5.1

Details

As written in the advisory (Markdown source, shown as plain text).

Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XSS via page name in the Atomik theme. A rogue editor can inject arbitrary JavaScript that executes in the context of any authenticated user visiting the affected account pages. This can lead to session hijacking, credential theft, malicious actions performed on behalf of users, and potential privilege escalation. Thanks Yonatan Drori (Tenzai) for reporting.

References

External links from the advisory. They lead to third-party sites.