What is CVE-2026-8353?

CVE-2026-8353 is a medium-severity vulnerability in Concrete Cms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-05-22.

How severe is CVE-2026-8353?

Medium severity. CVSS v3 base score is 4.8 out of 10.

XSS in Concrete Cms

CVE-2026-8353

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. Thi…

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.000 (6.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N.

Affected products

Concrete Cms — versions 9.0
Concretecms Concrete_cms

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

ff5b8ace-8b95-4078-9743-eac1ca5451de (release-notes, Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-8353?: CVE-2026-8353 is a medium-severity vulnerability in Concrete Cms, classified under Cross-site Scripting. CVSS score: 4.8/10. Published 2026-05-22.
How severe is CVE-2026-8353?: Medium severity. CVSS v3 base score is 4.8 out of 10.