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CVE-2021-39320 PoC — underConstruction <= 1.18 - Reflected Cross-Site Scripting

Source
https://github.com/projectdiscovery/nuclei-templates/blob/main/http/cves/2021/CVE-2021-39320.yaml
Associated Vulnerability
Title: underConstruction <= 1.18 - Reflected Cross-Site Scripting (CVE-2021-39320)
Description:The underConstruction plugin <= 1.18 for WordPress echoes out the raw value of `$GLOBALS['PHP_SELF']` in the ucOptions.php file. On certain configurations including Apache+modPHP, this makes it possible to use it to perform a reflected Cross-Site Scripting attack by injecting malicious code in the request path.
Description
WordPress Under Construction plugin before 1.19 contains a cross-site scripting vulnerability. The plugin echoes out the raw value of `$GLOBALS['PHP_SELF']` in the ucOptions.php file on certain configurations, including Apache+modPHP.
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