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In pfSense 2.4.4-p2 and 2.4.4-p3, if it is possible to trick an authenticated administrator into clicking on a button on a phishing page, an attacker can leverage XSS to upload arbitrary executable code, via diag_command.php and rrd_fetch_json.php (timePeriod parameter), to a server. Then, the remote attacker can run any command with root privileges on that server.
Use CWE-79, Netgate vendor hub and Pfsense product page to widen CVE-2019-12949 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2020-21487, CVE-2023-48123 and CVE-2023-42326 for nearby disclosures in the same product family.