Description
WordPress Plugin Far Future Expiry Header is prone to a cross-site request forgery vulnerability. Exploiting this issue may allow a remote attacker to perform certain administrative actions and gain unauthorized access to the affected application; other attacks are also possible. WordPress Plugin Far Future Expiry Header version 1.4 is vulnerable; prior versions may also be affected.
Remediation
Update to plugin version 1.5 or latest
References
https://sploitus.com/exploit?id=WPEX-ID:6010CE4E-3E46-4CC1-96D8-560B30B605ED
https://plugins.svn.wordpress.org/far-future-expiry-header/trunk/readme.txt