Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Concretecms | Concrete Cms | >= 9.0, < 9.5.1 |
Related Weaknesses (CWE)
References
- https://documentation.concretecms.org/9-x/developers/introduction/version-historRelease NotesVendor Advisory
FAQ
What is CVE-2026-8353?
CVE-2026-8353 is a vulnerability with a CVSS score of 4.8 (MEDIUM). 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 v...
How severe is CVE-2026-8353?
CVE-2026-8353 has been rated MEDIUM with a CVSS base score of 4.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-8353?
Check the references section above for vendor advisories and patch information. Affected products include: Concretecms Concrete Cms.