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Composr CMS 10.0.34 Persistent Cross-Site Scripting via banners

Composr CMS 10.0.34 contains a persistent cross-site scripting vulnerability that allows authenticated administrators to inject malicious scripts through the banner management interface. Attackers with admin credentials can inject XSS payloads in the Description field of the Add banner functionality, which execute for all website visitors when they access the home page.

CWE-79May 16, 2026
CVSS5.1v4.0EPSS0.239%PoCs1SignalsNot listed in CISA KEVNo known ransomware useNo Nuclei templatesSTIX