Description
WordPress Plugin QR Redirector is prone to a security bypass vulnerability. Exploiting this issue may allow attackers to perform otherwise restricted actions and subsequently change the redirect response status code of arbitrary QR Redirects. WordPress Plugin QR Redirector version 1.5 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 1.6 or latest
References
https://sploitus.com/exploit?id=WPEX-ID:240BED24-0315-4BBF-BA17-E4947E5ECACB
https://plugins.svn.wordpress.org/qr-redirector/trunk/readme.txt