diff --git a/gateway/platforms/slack.py b/gateway/platforms/slack.py
index afd1a8aa8..49890170b 100644
--- a/gateway/platforms/slack.py
+++ b/gateway/platforms/slack.py
@@ -1229,6 +1229,20 @@ class SlackAdapter(BasePlatformAdapter):
         msg_ts = message.get("ts", "")
         channel_id = body.get("channel", {}).get("id", "")
         user_name = body.get("user", {}).get("name", "unknown")
+        user_id = body.get("user", {}).get("id", "")
+
+        # Only authorized users may click approval buttons.  Button clicks
+        # bypass the normal message auth flow in gateway/run.py, so we must
+        # check here as well.
+        allowed_csv = os.getenv("SLACK_ALLOWED_USERS", "").strip()
+        if allowed_csv:
+            allowed_ids = {uid.strip() for uid in allowed_csv.split(",") if uid.strip()}
+            if "*" not in allowed_ids and user_id not in allowed_ids:
+                logger.warning(
+                    "[Slack] Unauthorized approval click by %s (%s) — ignoring",
+                    user_name, user_id,
+                )
+                return
 
         # Map action_id to approval choice
         choice_map = {
diff --git a/gateway/platforms/telegram.py b/gateway/platforms/telegram.py
index 85b8afc97..e127841b5 100644
--- a/gateway/platforms/telegram.py
+++ b/gateway/platforms/telegram.py
@@ -1398,6 +1398,15 @@ class TelegramAdapter(BasePlatformAdapter):
                     await query.answer(text="Invalid approval data.")
                     return
 
+                # Only authorized users may click approval buttons.
+                caller_id = str(getattr(query.from_user, "id", ""))
+                allowed_csv = os.getenv("TELEGRAM_ALLOWED_USERS", "").strip()
+                if allowed_csv:
+                    allowed_ids = {uid.strip() for uid in allowed_csv.split(",") if uid.strip()}
+                    if "*" not in allowed_ids and caller_id not in allowed_ids:
+                        await query.answer(text="⛔ You are not authorized to approve commands.")
+                        return
+
                 session_key = self._approval_state.pop(approval_id, None)
                 if not session_key:
                     await query.answer(text="This approval has already been resolved.")