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CVE-2026-49259 is a stored cross-site scripting vulnerability in NukeViet CMS 4.x through 4.5.08. A low-privileged authenticated user can inject malicious JavaScript through profile display name fields. The flaw is triggered when the attacker’s crafted display name is later incorporated into the Reply functionality for comments, where user-controlled data is passed into an inline JavaScript handler without safe JavaScript-context encoding. Because the application relies on HTML entity encoding rather than proper JavaScript string encoding, an attacker can break out of the intended context and execute script in the victim’s browser when the Reply link is clicked.
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