CVE-2026-45121 | MyBB up to 1.8.39 Calendar calendar.php permission

August 18, 2026 Yanac

A vulnerability marked as problematic has been reported in MyBB up to 1.8.39. This vulnerability affects unknown code of the file calendar.php of the component Calendar Module. This manipulation causes permission issues.

This vulnerability is handled as CVE-2026-45121. The attack can be initiated remotely. There is not any exploit available.

It is suggested to upgrade the affected component.VulDB Recent EntriesRead More