Steam API Glitch Exposes Kingdom Hearts 4 Worlds, Including Star Wars

Key points

• A Steam API glitch exposed achievement data for unreleased titles, including Kingdom Hearts 4, Persona 6, and Fable.
• Leaked data suggests Kingdom Hearts 4 will feature worlds based on Star Wars, Coco, Toy Story, and Zootopia.
• Valve and Exophase confirmed the issue was a maintenance bug, not a deliberate leak, affecting private achievement data.
• Kingdom Hearts 4 is scheduled for release in 2027, with only the Coco world officially confirmed by Disney so far.

Background

Kingdom Hearts 4 has been in development for several years, with franchise co-creator Tetsuya Nomura confirming a 2027 release at Disney’s D23 Expo. Previous leaks and trailers hinted at Star Wars connections, but this is the first time specific world names have surfaced via achievement data. The game is expected to launch on PC, PlayStation 5, Xbox Series X, and Nintendo Switch 2.

How outlets are covering it

GameSpot focused on the specific Kingdom Hearts 4 worlds revealed, highlighting Star Wars as the most surprising addition. Game Informer emphasized the broader scope of the leak, noting that achievements for numerous other games like Persona 6 and Gears of War: E-Day were also exposed. GamesIndustry.biz clarified the technical cause, citing GameDiscoverCo founder Simon Carless and Exophase owner Mike Bendel, who confirmed the issue was a Valve API bug following a maintenance window, not a security breach.

Why it matters

The leak provides the first concrete hints about Kingdom Hearts 4’s content, potentially shaping fan expectations and marketing strategies for Square Enix and Disney. It also highlights ongoing concerns about data security and API stability on major platforms like Steam, affecting how unreleased game information is protected.

What to watch

Valve is expected to fix the API bug, and developers may need to re-secure their achievement data. Square Enix and Disney may address the leaked worlds in future announcements, though no official confirmation is expected until closer to the 2027 release.