PT-2026-42774 · Concrete Cms · Concrete Cms

Yonatan Drori

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Published

2026-05-22

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Updated

2026-05-22

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CVE-2026-8353

CVSS v4.0

2.1

Low

VectorAV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
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.

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

CVE-2026-8353

Affected Products

Concrete Cms