diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2c1dd4f9f16..e2b50510d31 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -29,6 +29,7 @@ Docs: https://docs.openclaw.ai
 - Zalo Personal/group gating: stop reapplying `dmPolicy.allowFrom` as a sender gate for already-allowlisted groups when `groupAllowFrom` is unset, so any member of an allowed group can trigger replies while DMs stay restricted. (#40146)
 - Browser/remote CDP: honor strict browser SSRF policy during remote CDP reachability and `/json/version` discovery checks, redact sensitive `cdpUrl` tokens from status output, and warn when remote CDP targets private/internal hosts.
 - Plugins/install precedence: keep bundled plugins ahead of auto-discovered globals by default, but let an explicitly installed plugin record win its own duplicate-id tie so installed channel plugins load from `~/.openclaw/extensions` after `openclaw plugins install`.
+- Subagents/follow-ups: require the same controller ownership checks for `/subagents send` as other control actions, so leaf sessions cannot message nested child runs they do not control. Thanks @vincentkoc.
 - Inbound policy hardening: tighten callback and webhook sender checks across Mattermost and Google Chat, match Nextcloud Talk rooms by stable room token, and treat explicit empty Twitch allowlists as deny-all. (#46787) Thanks @zpbrent, @ijxpwastaken and @vincentkoc.
 - macOS/canvas actions: keep unattended local agent actions on trusted in-app canvas surfaces only, and stop exposing the deep-link fallback key to arbitrary page scripts. (#46790) Thanks @vincentkoc.
 - Agents/compaction: extend the enclosing run deadline once while compaction is actively in flight, and abort the underlying SDK compaction on timeout/cancel so large-session compactions stop freezing mid-run. (#46889) Thanks @asyncjason.
diff --git a/src/agents/subagent-control.test.ts b/src/agents/subagent-control.test.ts
new file mode 100644
index 00000000000..fec77ad025b
--- /dev/null
+++ b/src/agents/subagent-control.test.ts
@@ -0,0 +1,38 @@
+import { describe, expect, it } from "vitest";
+import type { OpenClawConfig } from "../config/config.js";
+import { sendControlledSubagentMessage } from "./subagent-control.js";
+
+describe("sendControlledSubagentMessage", () => {
+  it("rejects runs controlled by another session", async () => {
+    const result = await sendControlledSubagentMessage({
+      cfg: {
+        channels: { whatsapp: { allowFrom: ["*"] } },
+      } as OpenClawConfig,
+      controller: {
+        controllerSessionKey: "agent:main:subagent:leaf",
+        callerSessionKey: "agent:main:subagent:leaf",
+        callerIsSubagent: true,
+        controlScope: "children",
+      },
+      entry: {
+        runId: "run-foreign",
+        childSessionKey: "agent:main:subagent:other",
+        requesterSessionKey: "agent:main:main",
+        requesterDisplayKey: "main",
+        controllerSessionKey: "agent:main:subagent:other-parent",
+        task: "foreign run",
+        cleanup: "keep",
+        createdAt: Date.now() - 5_000,
+        startedAt: Date.now() - 4_000,
+        endedAt: Date.now() - 1_000,
+        outcome: { status: "ok" },
+      },
+      message: "continue",
+    });
+
+    expect(result).toEqual({
+      status: "forbidden",
+      error: "Subagents can only control runs spawned from their own session.",
+    });
+  });
+});
diff --git a/src/agents/subagent-control.ts b/src/agents/subagent-control.ts
index 528a84eebd3..6594e5c7877 100644
--- a/src/agents/subagent-control.ts
+++ b/src/agents/subagent-control.ts
@@ -686,9 +686,24 @@ export async function steerControlledSubagentRun(params: {
 
 export async function sendControlledSubagentMessage(params: {
   cfg: OpenClawConfig;
+  controller: ResolvedSubagentController;
   entry: SubagentRunRecord;
   message: string;
 }) {
+  const ownershipError = ensureControllerOwnsRun({
+    controller: params.controller,
+    entry: params.entry,
+  });
+  if (ownershipError) {
+    return { status: "forbidden" as const, error: ownershipError };
+  }
+  if (params.controller.controlScope !== "children") {
+    return {
+      status: "forbidden" as const,
+      error: "Leaf subagents cannot control other sessions.",
+    };
+  }
+
   const targetSessionKey = params.entry.childSessionKey;
   const parsed = parseAgentSessionKey(targetSessionKey);
   const storePath = resolveStorePath(params.cfg.session?.store, { agentId: parsed?.agentId });
diff --git a/src/auto-reply/reply/commands-subagents/action-send.ts b/src/auto-reply/reply/commands-subagents/action-send.ts
index 3e764e2a6bb..9414313b381 100644
--- a/src/auto-reply/reply/commands-subagents/action-send.ts
+++ b/src/auto-reply/reply/commands-subagents/action-send.ts
@@ -37,8 +37,9 @@ export async function handleSubagentsSendAction(
     return stopWithText(`${formatRunLabel(targetResolution.entry)} is already finished.`);
   }
 
+  const controller = resolveCommandSubagentController(params, ctx.requesterKey);
+
   if (steerRequested) {
-    const controller = resolveCommandSubagentController(params, ctx.requesterKey);
     const result = await steerControlledSubagentRun({
       cfg: params.cfg,
       controller,
@@ -61,6 +62,7 @@ export async function handleSubagentsSendAction(
 
   const result = await sendControlledSubagentMessage({
     cfg: params.cfg,
+    controller,
     entry: targetResolution.entry,
     message,
   });
@@ -70,6 +72,9 @@ export async function handleSubagentsSendAction(
   if (result.status === "error") {
     return stopWithText(`⚠️ Subagent error: ${result.error} (run ${result.runId.slice(0, 8)}).`);
   }
+  if (result.status === "forbidden") {
+    return stopWithText(`⚠️ ${result.error ?? "send failed"}`);
+  }
   return stopWithText(
     result.replyText ??
       `✅ Sent to ${formatRunLabel(targetResolution.entry)} (run ${result.runId.slice(0, 8)}).`,
diff --git a/src/auto-reply/reply/commands.test.ts b/src/auto-reply/reply/commands.test.ts
index f6d2d88f5ba..2d8e6458933 100644
--- a/src/auto-reply/reply/commands.test.ts
+++ b/src/auto-reply/reply/commands.test.ts
@@ -1887,6 +1887,53 @@ describe("handleCommands subagents", () => {
     expect(waitCall).toBeDefined();
   });
 
+  it("blocks leaf subagents from sending to explicitly-owned child sessions", async () => {
+    const leafKey = "agent:main:subagent:leaf";
+    const childKey = `${leafKey}:subagent:child`;
+    const storePath = path.join(testWorkspaceDir, "sessions-subagents-send-scope.json");
+    await updateSessionStore(storePath, (store) => {
+      store[leafKey] = {
+        sessionId: "leaf-session",
+        updatedAt: Date.now(),
+        spawnedBy: "agent:main:main",
+        subagentRole: "leaf",
+        subagentControlScope: "none",
+      };
+      store[childKey] = {
+        sessionId: "child-session",
+        updatedAt: Date.now(),
+        spawnedBy: leafKey,
+        subagentRole: "leaf",
+        subagentControlScope: "none",
+      };
+    });
+    addSubagentRunForTests({
+      runId: "run-child-send",
+      childSessionKey: childKey,
+      requesterSessionKey: leafKey,
+      requesterDisplayKey: leafKey,
+      task: "child follow-up target",
+      cleanup: "keep",
+      createdAt: Date.now() - 20_000,
+      startedAt: Date.now() - 20_000,
+      endedAt: Date.now() - 1_000,
+      outcome: { status: "ok" },
+    });
+    const cfg = {
+      commands: { text: true },
+      channels: { whatsapp: { allowFrom: ["*"] } },
+      session: { store: storePath },
+    } as OpenClawConfig;
+    const params = buildParams("/subagents send 1 continue with follow-up details", cfg);
+    params.sessionKey = leafKey;
+
+    const result = await handleCommands(params);
+
+    expect(result.shouldContinue).toBe(false);
+    expect(result.reply?.text).toContain("Leaf subagents cannot control other sessions.");
+    expect(callGatewayMock).not.toHaveBeenCalled();
+  });
+
   it("steers subagents via /steer alias", async () => {
     callGatewayMock.mockImplementation(async (opts: unknown) => {
       const request = opts as { method?: string };