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A cross-site scripting (XSS) vulnerability was discovered in the alert and confirm dialogs when these dialogs were provided with malicious HTML content. This can occur in plugins that use the alert or confirm dialogs, such as in the `image` plugin, which presents these dialogs when certain errors occur. The vulnerability allowed arbitrary JavaScript execution when an alert presented in the TinyMCE UI for the current user.

The issue allows an attacker to download and execute an arbitrary file from their server during the upgrade process.

The issue allows remote attackers to overwrite arbitrary files via directory traversal sequences in a filename within nsz archive. This is due to a problem in the nsGreen.dll component.