diff --git a/CHANGELOG.md b/CHANGELOG.md
index e787efb34ba..31c1f6a7966 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ Docs: https://docs.openclaw.ai
 
 ### Fixes
 
+- Security/Windows: avoid shell invocation when spawning child processes to prevent cmd.exe metacharacter injection via untrusted CLI arguments (e.g. agent prompt text).
 - Agents: deliver tool result media (screenshots, images, audio) to channels regardless of verbose level. (#11735) Thanks @strelov1.
 - Telegram: when `channels.telegram.commands.native` is `false`, exclude plugin commands from `setMyCommands` menu registration while keeping plugin slash handlers callable. (#15132) Thanks @Glucksberg.
 - LINE: return 200 OK for Developers Console "Verify" requests (`{"events":[]}`) without `X-Line-Signature`, while still requiring signatures for real deliveries. (#16582) Thanks @arosstale.
diff --git a/scripts/test-parallel.mjs b/scripts/test-parallel.mjs
index 140a4c6c927..4f23a556da7 100644
--- a/scripts/test-parallel.mjs
+++ b/scripts/test-parallel.mjs
@@ -223,7 +223,6 @@ const runOnce = (entry, extraArgs = []) =>
     const child = spawn(pnpm, args, {
       stdio: "inherit",
       env: { ...process.env, VITEST_GROUP: entry.name, NODE_OPTIONS: nextNodeOptions },
-      shell: process.platform === "win32",
     });
     children.add(child);
     child.on("exit", (code, signal) => {
@@ -277,7 +276,6 @@ if (passthroughArgs.length > 0) {
     const child = spawn(pnpm, args, {
       stdio: "inherit",
       env: { ...process.env, NODE_OPTIONS: nextNodeOptions },
-      shell: process.platform === "win32",
     });
     children.add(child);
     child.on("exit", (exitCode, signal) => {
diff --git a/scripts/ui.js b/scripts/ui.js
index 66c1ffe1468..5f6c753f4e2 100644
--- a/scripts/ui.js
+++ b/scripts/ui.js
@@ -55,7 +55,6 @@ function run(cmd, args) {
     cwd: uiDir,
     stdio: "inherit",
     env: process.env,
-    shell: process.platform === "win32",
   });
   child.on("exit", (code, signal) => {
     if (signal) {
@@ -70,7 +69,6 @@ function runSync(cmd, args, envOverride) {
     cwd: uiDir,
     stdio: "inherit",
     env: envOverride ?? process.env,
-    shell: process.platform === "win32",
   });
   if (result.signal) {
     process.exit(1);
diff --git a/src/daemon/launchd.ts b/src/daemon/launchd.ts
index 56da87df332..85d632d106b 100644
--- a/src/daemon/launchd.ts
+++ b/src/daemon/launchd.ts
@@ -107,7 +107,6 @@ async function execLaunchctl(
   try {
     const { stdout, stderr } = await execFileAsync("launchctl", args, {
       encoding: "utf8",
-      shell: process.platform === "win32",
     });
     return {
       stdout: String(stdout ?? ""),
diff --git a/src/process/exec.test.ts b/src/process/exec.test.ts
index ae8a865ad18..7e1dd1f0232 100644
--- a/src/process/exec.test.ts
+++ b/src/process/exec.test.ts
@@ -1,7 +1,16 @@
 import { describe, expect, it } from "vitest";
-import { runCommandWithTimeout } from "./exec.js";
+import { runCommandWithTimeout, shouldSpawnWithShell } from "./exec.js";
 
 describe("runCommandWithTimeout", () => {
+  it("never enables shell execution (Windows cmd.exe injection hardening)", () => {
+    expect(
+      shouldSpawnWithShell({
+        resolvedCommand: "npm.cmd",
+        platform: "win32",
+      }),
+    ).toBe(false);
+  });
+
   it("passes env overrides to child", async () => {
     const result = await runCommandWithTimeout(
       [process.execPath, "-e", 'process.stdout.write(process.env.OPENCLAW_TEST_ENV ?? "")'],
diff --git a/src/process/exec.ts b/src/process/exec.ts
index 64d217c1034..0cbd77263ac 100644
--- a/src/process/exec.ts
+++ b/src/process/exec.ts
@@ -29,6 +29,19 @@ function resolveCommand(command: string): string {
   return command;
 }
 
+export function shouldSpawnWithShell(params: {
+  resolvedCommand: string;
+  platform: NodeJS.Platform;
+}): boolean {
+  // SECURITY: never enable `shell` for argv-based execution.
+  // `shell` routes through cmd.exe on Windows, which turns untrusted argv values
+  // (like chat prompts passed as CLI args) into command-injection primitives.
+  // If you need a shell, use an explicit shell-wrapper argv (e.g. `cmd.exe /c ...`)
+  // and validate/escape at the call site.
+  void params;
+  return false;
+}
+
 // Simple promise-wrapped execFile with optional verbosity logging.
 export async function runExec(
   command: string,
@@ -117,14 +130,14 @@ export async function runCommandWithTimeout(
 
   const stdio = resolveCommandStdio({ hasInput, preferInherit: true });
   const resolvedCommand = resolveCommand(argv[0] ?? "");
-  const commandExt = path.extname(resolvedCommand).toLowerCase();
-  const useShell = process.platform === "win32" && commandExt !== ".exe";
   const child = spawn(resolvedCommand, argv.slice(1), {
     stdio,
     cwd,
     env: resolvedEnv,
     windowsVerbatimArguments,
-    shell: useShell,
+    ...(shouldSpawnWithShell({ resolvedCommand, platform: process.platform })
+      ? { shell: true }
+      : {}),
   });
   // Spawn with inherited stdin (TTY) so tools like `pi` stay interactive when needed.
   return await new Promise((resolve, reject) => {
diff --git a/src/tui/tui-local-shell.ts b/src/tui/tui-local-shell.ts
index 436a833ccf5..58f01ba78f3 100644
--- a/src/tui/tui-local-shell.ts
+++ b/src/tui/tui-local-shell.ts
@@ -107,6 +107,8 @@ export function createLocalShellRunner(deps: LocalShellDeps) {
 
     await new Promise<void>((resolve) => {
       const child = spawnCommand(cmd, {
+        // Intentionally a shell: this is an operator-only local TUI feature (prefixed with `!`)
+        // and is gated behind an explicit in-session approval prompt.
         shell: true,
         cwd: getCwd(),
         env,