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Vulnerabilities CVE-2026-8203

CVE-2026-8203

High
Open
TLP:CLEAR

Concrete CMS 9.5.0 and below has Stored XSS on the height parameter

NVD CVE.org
Critical Infrastructure Data Exfiltration

AI Analysis

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Description

Concrete CMS 9.5.0 and below has Stored XSS on the height parameter. The controller does not validate or sanitize $height. Any user with editor privileges can inject malicious JavaScript that executes in the context of any visitor's browser, potentially leading to session hijacking, credential theft, or other malicious actions. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 7.3 with vector CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N. Thanks Alfin Joseph for reporting.

Details

CVSS Score
7.3
EPSS Score
0.12%

2.3th percentile

CVSS Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:H/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Confidence
90%
Published
May 21, 2026
Last Modified
May 22, 2026
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