Pale Moon has been updated to version 28.4.1. This is a security and bugfix update. The Linux version will follow later today.
Note that the update includes fixes identified as "Defense-in-Depth" which means that it is a fix that does not apply to a (potentially) actively exploitable vulnerability in Pale Moon, but prevents future vulnerabilities caused by the same code, e.g. when surrounding code changes, exposing the problem, or when new attack vectors are discovered.
Release Notes
Note that the update includes fixes identified as "Defense-in-Depth" which means that it is a fix that does not apply to a (potentially) actively exploitable vulnerability in Pale Moon, but prevents future vulnerabilities caused by the same code, e.g. when surrounding code changes, exposing the problem, or when new attack vectors are discovered.
Release Notes