diff --git a/CHANGELOG.md b/CHANGELOG.md
index f2e4eacb4..15a31d78b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1832,6 +1832,7 @@ Thanks @AlexMikhalev, @CoreyH, @John-Rood, @KrauseFx, @MaudeBot, @Nachx639, @Nic
 - Tests/Agents: add regression coverage for workspace tool path resolution and bash cwd defaults.
 - iOS/Android: enable stricter concurrency/lint checks; fix Swift 6 strict concurrency issues + Android lint errors (ExifInterface, obsolete SDK check). (#662) — thanks @KristijanJovanovski.
 - Auth: read Codex CLI keychain tokens on macOS before falling back to `~/.codex/auth.json`, preventing stale refresh tokens from breaking gateway live tests.
+- Security/Exec approvals: reject shell command substitution (`$()` and backticks) inside double quotes to prevent exec allowlist bypass. Thanks @simecek.
 - iOS/macOS: share `AsyncTimeout`, require explicit `bridgeStableID` on connect, and harden tool display defaults (avoids missing-resource label fallbacks).
 - Telegram: serialize media-group processing to avoid missed albums under load.
 - Signal: handle `dataMessage.reaction` events (signal-cli SSE) to avoid broken attachment errors. (#637) — thanks @neist.