CVE-2021-24559 Information

Description

The Qyrr WordPress plugin before 0.7 does not escape the data-uri of the QR Code when outputting it in a src attribute allowing for Cross-Site Scripting attacks. Furthermore the data_uri_to_meta AJAX action available to all authenticated users only had a CSRF check in place with the nonce available to users with a role as low as Contributor allowing any user with such role (and above) to set a malicious data-uri in arbitrary QR Code posts leading to a Stored Cross-Site Scripting issue.

Reference

https://wpscan.com/vulnerability/65a29976-163a-4bbf-a4e8-590ddc4b83f2/