The Custom Content Shortcode WordPress plugin through 4.0.2 does not validate one of its shortcode attribute, which could allow users with a contributor role and above to include arbitrary files via a traversal attack. This could also allow them to read non PHP files and retrieve their content. RCE could also be achieved if the attacker manage to upload a malicious image containing PHP code, and then include it via the affected attribute, on a default WP install, authors could easily achieve that given that they have the upload_file capability.
[
{
"vendor": "Unknown",
"product": "Custom Content Shortcode",
"versions": [
{
"status": "affected",
"versionType": "custom",
"version": "0",
"lessThanOrEqual": "4.0.2"
}
],
"defaultStatus": "affected",
"collectionURL": "https://wordpress.org/plugins"
}
]