Activision has detailed a new anti-cheat system called "server culling" that will be implemented in Call of Duty: Modern Warfare 4, designed to combat the long-standing issue of wallhacks. This technology aims to make the game more fair by limiting the information clients receive about player locations.
Wallhacks allow cheaters to perceive enemy positions through solid objects, a problem that has affected the Call of Duty franchise for years. Traditionally, game servers share player location data with all connected clients, even if those players are out of sight. Server culling addresses this by building occlusion layers into the game's environments. Consequently, if a player cannot see an enemy due to a wall or other obstruction, the game's backend will also withhold that enemy's location data from the client. This means that wallhack exploits, which rely on receiving this hidden data, will be rendered ineffective.
"For legitimate players, the match plays exactly as intended," Activision stated in a social media post. "For cheat developers, this creates a major new obstacle." The publisher emphasized that cheat software cannot reveal information it never receives, positioning server culling as a fundamental shift in the fight for fair play.
This new system will be integrated across all multiplayer maps in Modern Warfare 4 at launch. Its benefits will also extend to the DMZ-like Combat Outpost mode and Warzone. The server culling technology will operate in conjunction with existing anti-cheat measures across all platforms.
Activision anticipates that server culling will significantly disrupt the market for cheats. While acknowledging that cheat developers will likely seek new methods to circumvent these protections, the company pledged to remain vigilant and continue improving the player experience. The game is set to launch on October 23, 2026, for PC, Nintendo Switch 2, PlayStation 5, and Xbox Series X/S. The franchise has also introduced other changes, such as modifications to Double XP tokens and the inclusion of actor Mads Mikkelsen as a villain in the campaign, indicating a broader effort to engage players.