CVE-2021-24559: Patrickposner Qyrr

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Patrickposner Qyrr: before 0.7 (fixed in 0.7)

Published 2024-01-16. Last modified 2026-06-17.