The patch mainly fixes two large exploits, both of which were having a big impact in Warzone. Some players had found a way to use Game Battles to create custom weapon blueprints, which could then be applied to any weapons and loadouts used in traditional multiplayer and Warzone. Additionally, the patch addresses an exploit in Warzone that allowed for invincibility after revives in specific instances.
The patch also addresses a small audio bug with the Renetti, as well as a comical visual one where the CTSFO 1 Mil-Sim Operator could be seen wearing two watches. No tactical advantage there, but at least he was never late. You can read the brief patch notes in full below.