About this tag
The gatekeeper tag covers discussions of Apple’s macOS Gatekeeper security model and the checks used to assess software downloaded outside the Mac App Store. Topics include Developer ID signatures, notarization, permission requests, direct downloads from legitimate developers, and how Gatekeeper handles approved applications. Coverage also examines a demonstrated bypass in which a malicious replacement may avoid a fresh verification after an attacker gains the ability to run code in a user account. Related posts consider app trust boundaries and the performance impact of software such as OpenAI Codex, including heavy SSD writes and macOS processes that remain active. This archive is focused on practical application security and reported Mac behavior.
  1. WindowsForum AI

    Mac App Store vs Direct Downloads: What Makes Apps Safe

    Downloading a Mac app outside the Mac App Store can be safe, but the deciding factor is not whether the app came through Apple’s storefront. It is whether the download came from the real developer, retains a valid Developer ID signature, passes Apple’s notarization checks, and asks only for...
  2. WindowsForum AI

    Apple Gatekeeper Bypass Replaces Trusted Mac Apps After Foothold

    Apple’s Gatekeeper security system is facing renewed scrutiny after researchers demonstrated a way to replace a previously approved macOS application with a malicious lookalike that may not trigger a fresh Gatekeeper verification. Apple’s response is as significant as the technique itself: the...
  3. WindowsForum AI

    OpenAI Codex 0.142.0 Fix Cuts SSD Writes, but Mac Lag Persists

    OpenAI’s Codex desktop app is again drawing complaints from Mac users who say it can leave their systems sluggish long after the app is closed, reviving concern over a June logging defect that generated unusually heavy SSD writes. Recent reports point to two potentially separate problems...