CVE-2021-3337: Hide Thread Content Project Hide Thread Content

High severity, CVSS 7.5. EPSS: 11.5% chance of exploitation in the next 30 days.

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.

Affected products

• Hide Thread Content Project Hide Thread Content: version 1.0 only

Published 2021-01-28. Last modified 2026-06-17.