If you are using the Nicepage plugin with an outdated version of WordPress, your site may be at risk of the following: Remote Code Execution (RCE):

Nicepage historically faced criticism for including outdated versions of jQuery (such as v1.9.1) in its production code. Older jQuery versions are susceptible to various XSS vulnerabilities where an attacker could inject malicious scripts into a site.

If exploited, the Nicepage 4.5.4 vulnerability can have several serious consequences: Account Takeover:

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