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CVE-2026-81900 Concrete CMS before 9.5.3 is vulnerable to Stored XSS in the YouTube block (vWidth/vHeight)

🗓️ 14 Sep 2026 22:07:58Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 4 Views

Stored XSS in Concrete CMS before 9.5.3 YouTube block via unescaped vWidth/vHeight attributes.

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18 Sep 2026 03:48Current
5.4Medium risk
Vulners AI Score5.4
CVSS 47.3
4