Modern Warfare 4 Adds Server Culling to Kill Wallhacks — and Details Its DMZ Return

TUESDAY, OCTOBER 6, 2026 — Wallhacks have been Call of Duty’s oldest plague: cheaters see every enemy through every wall because the server tells their machine where everyone is, whether they should know or not. With seventeen days to go until Call of Duty: Modern Warfare 4 launches October 23, Activision and Infinity Ward have shown off their answer: Server Culling, a system that simply withholds the locations of hidden opponents from each player’s device. “Cheat software can’t reveal information it never receives,” the Call of Duty team said, in video and posts published on the official Call of Duty social accounts and reported by GHacks. When a player shouldn’t be able to know where an opponent is, the server can now withhold that opponent’s location data from their hardware. It is the most structural anti-cheat move the series has ever shipped — and it lands alongside a fully detailed DMZ return.

The systemHow Server Culling starves wallhacks

The insight behind the system is brutally simple, and it is worth understanding because it explains why earlier anti-cheat never quite worked. Wallhacks function because game servers normally share information such as each player’s position with every client, even when an enemy is out of sight. A cheat program running on a player’s machine just reads data the server handed over and draws it on screen. Infinity Ward’s answer is to stop handing it over: the studio built occlusion layers into the environments of all launch maps, and with those in place, the server limits the information sent to each client to what that player can actually see. An enemy behind a wall is no longer reported to the device of a player who cannot see that enemy — so cheat software on that device has nothing to display.

Activision states that normal gameplay is not affected: “For legitimate players, the match plays exactly as intended,” the publisher said. “For cheat developers, this creates a major new obstacle.” The company expects Server Culling to “disturb the cheat marketplace” and says it will not “sit on our hands” after launch. There are honest caveats, and they matter: the system targets wallhacks specifically and runs alongside the existing anti-cheat layers on all platforms rather than replacing them — it does nothing for aimbots or speed hacks. There is no setting for players to toggle; it runs on Activision’s servers, and you get it automatically. And Activision has not shared data on how much wallhack use it expects the system to remove, nor how it will respond if cheat developers find a way around server-side culling. That said, the coverage is wide: every multiplayer map available at launch, Warzone, and future updates are covered. Players should keep using the in-game reporting tools for suspected cheaters, since no single layer catches everything.

The modeDMZ returns: Forward Operating Base, Hajin, 70 levels

The bigger story from this week’s coverage is the DMZ deep dive, published in an official breakdown on October 5 via the PlayStation Blog. Activision’s Daniel Noel calls DMZ “Call of Duty’s definitive extraction shooter experience,” and the design backs up the swagger. DMZ launches alongside the campaign and multiplayer on October 23.

Everything revolves around the Forward Operating Base (FOB), a persistent hub where you spend time between deployments: it starts as a foothold and grows into a fully operational base with more than a dozen stations as you complete Operations across Hajin. Five stations are open from the start — Operators, DMZ Orders (reviewing missions on your Orders Tablet), Stash/Loadout, a Firing Range for testing weapons, and Deploy. The unlockable stations are where the long game lives: a 3D Printer that crafts gear and upgrades other stations; a Gunsmith where you buy attachments with DMZ Cash or build weapons by extracting with a Weapon Manual; a Vendor with rotating daily stock; a Bounty Leaderboard; a Boss Board tracking Lieutenants, the AI bosses roaming Hajin; a Dog Tag Case for showing off tags from defeated Operators; and a Contract Stand for bounty work. Every unlock is earned by playing — the mode runs on a dedicated DMZ progression track from level 1 to 70, unlocking stations and rewards along the way.

Deployments into the Hajin Exclusion Zone come in three flavors: Story Missions you can replay for big rewards, Dynamic Operations that pay DMZ Cash and XP plus a Supply Drop for each completed Op, or pure Free Roam. Every area of Hajin carries a Threat Level — making noise draws a violent enemy response, so stealth matters — and vehicles cover land, water and air, needing regular refueling and repairs at service stations. Defeating Lieutenants and Commanders yields XP, weapons and loot, and every run is scored on a final match rating, with an S rank paying the highest rewards. It is the most fully formed extraction loop Call of Duty has ever shipped — and it is clearly built for the long season, not a launch-month novelty.

The campaignKorea, Price off the books, and Mads Mikkelsen

The campaign centers on a full-scale invasion of the Korean Peninsula, told through two protagonists: Private Park Hyun-Jun, a South Korean Marine recruit fighting alongside his Sierra-1 squad (including fellow conscripts Park, Jay, Cho and Moon, and embedded U.S. Marines West and Dunn), and Captain John Price, now off the books on his own mission after the events of Modern Warfare III. Missions span the peninsula and beyond — New York, Paris and Mumbai are all on the itinerary — and the villain is played by Mads Mikkelsen, a casting reveal that landed in the campaign trailer this September. It is a ripped-from-the-headlines setup: Infinity Ward’s narrative director Jeff Negus has said the studio wanted the story to reflect the real-world role of American troops stationed in South Korea, and co-studio head Jack O’Hara has said the team consulted regional specialists, North Korean defectors and the studio’s own Korean employees to portray the setting respectfully.

Multiplayer12 maps, Kill Block, no hipfire bloom

Multiplayer ships with 12 core 6v6 maps at launch, plus returning modes including Gunfight (with a dedicated map pool) and Big War on large-scale maps. The headline new arena is Kill Block, with dynamic layouts that shift as the match progresses across more than 500 possible configurations. Gunplay gets a real change: hipfire bloom is gone, so firing from the hip no longer penalizes accuracy — and movement adds the ability to hang and shimmy along edges and pipes. It does not use the Omnimovement system from Treyarch’s Black Ops entries; Infinity Ward says the goal was to make movement fast and fluid on its own terms.

The fine printLaunch logistics: where, when, and the Game Pass question

The practical details, checked against Xbox, the Xbox Store and Activision’s own materials: Modern Warfare 4 launches October 23, 2026 on PC, Nintendo Switch 2, PlayStation 5 and Xbox Series X|S — with Xbox Play Anywhere support, and it is the series’ first day-and-date Nintendo release in over a decade. It is not on Game Pass at launch. GameRant reported on October 1 that the developers plan to add it to the catalog in late 2027, so subscribers should budget for a separate purchase rather than counting on a day-one drop. Some editions include campaign early access starting October 16. And a heads-up for PC players: the Xbox Store copy states that TPM 2.0 and Secure Boot are required, with other security measures possible — check your rig in System Information before launch night, especially if you dual-boot or have Secure Boot off. For the rest of October’s gaming calendar, see our E-Day launch-day guide, and if new PC hardware is in your plans, read up on the DDR5 price crisis first.