CVE-2021-3337
The Hide-Thread-Content plugin through 2021-01-27 for MyBB allows remote attackers to bypass intended content-reading restrictions by clicking on reply or quote in the postbit.
Date published : 2021-01-28
http://packetstormsecurity.com/files/161185/MyBB-Hide-Thread-Content-1.0-Information-Disclosure.html