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Description

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. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.1 with vector CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks Yonatan Drori (Tenzai) for reporting.

PUBLISHED Reserved 2026-05-11 | Published 2026-05-22 | Updated 2026-05-22 | Assigner ConcreteCMS




LOW: 2.1CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Problem types

CWE-79 Improper neutralization of input during web page generation ('cross-site scripting')

Product status

Default status
unaffected

9.0 (git)
affected

Credits

Yonatan Drori (Tenzai) finder

References

documentation.concretecms.org/...n-history/951-release-notes release-notes

cve.org (CVE-2026-8353)

nvd.nist.gov (CVE-2026-8353)

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