CVE-2021-41750

Reflected cross-site scripting in CraftCMS SEOmatic plugin by Nystudio 107

Discovered by Jack Misiura on behalf of The Missing Link Security

Vulnerability Details

A cross-site scripting (XSS) vulnerability in the SEOmatic plugin 3.4.10 for Craft CMS 3 allows remote attackers to inject arbitrary web script via a GET to /index.php?action=seomatic/file/seo-file-link with url parameter containing the base64 encoded URL of a malicious web page / file and fileName parameter containing an arbitrary filename with the intended content-type to be rendered in the user's browser as the extension.

Affected Versions

Discovered in 3.4.10

Fixed Versions

Discovered in 3.4.11