CVE-2026-8353

MEDIUM

Concrete CMS version 9.0 to 9.5.0 is vulnerable to Stored XSS via page name in atomik theme

Title source: cna
STIX 2.1

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.

References (1)

Core 1

Scores

CVSS v3 4.8
EPSS 0.0020
EPSS Percentile 9.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
Concrete CMS/Concrete CMS 9.0 - 9.5.0
concretecms/concrete_cms 9.0 - 9.5.1
Published May 22, 2026
Tracked Since May 22, 2026