diff --git a/CHANGELOG.md b/CHANGELOG.md
index a76ec655cdf..b152d63eaf1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@ Docs: https://docs.openclaw.ai
 - Security/Exec approvals: prevent safeBins allowlist bypass via shell expansion (host exec allowlist mode only; not enabled by default). Thanks @christos-eth.
 - Security/Gateway: block `system.execApprovals.*` via `node.invoke` (use `exec.approvals.node.*` instead). Thanks @christos-eth.
 - Security/Exec: harden PATH handling by disabling project-local `node_modules/.bin` bootstrapping by default, disallowing node-host `PATH` overrides, and spawning ACP servers via the current executable by default. Thanks @akhmittra.
+- Security/Gateway: prevent SSRF by ignoring user-provided `gatewayUrl` tool inputs (gateway URL must come from config). Thanks @p80n-sec.
 - CLI: fix lazy core command registration so top-level maintenance commands (`doctor`, `dashboard`, `reset`, `uninstall`) resolve correctly instead of exposing a non-functional `maintenance` placeholder command.
 - Telegram: when `channels.telegram.commands.native` is `false`, exclude plugin commands from `setMyCommands` menu registration while keeping plugin slash handlers callable. (#15132) Thanks @Glucksberg.
 - Security/Agents: scope CLI process cleanup to owned child PIDs to avoid killing unrelated processes on shared hosts. Thanks @aether-ai-agent.
diff --git a/src/agents/tools/gateway.e2e.test.ts b/src/agents/tools/gateway.e2e.test.ts
index b9d470c1532..ad18edcc6f6 100644
--- a/src/agents/tools/gateway.e2e.test.ts
+++ b/src/agents/tools/gateway.e2e.test.ts
@@ -20,7 +20,7 @@ describe("gateway tool defaults", () => {
     expect(opts.url).toBeUndefined();
   });
 
-  it("passes through explicit overrides", async () => {
+  it("accepts allowlisted gatewayUrl overrides (SSRF hardening)", async () => {
     callGatewayMock.mockResolvedValueOnce({ ok: true });
     await callGatewayTool(
       "health",
diff --git a/src/infra/outbound/message.e2e.test.ts b/src/infra/outbound/message.e2e.test.ts
index fa2dfea6ef5..531671d893e 100644
--- a/src/infra/outbound/message.e2e.test.ts
+++ b/src/infra/outbound/message.e2e.test.ts
@@ -3,6 +3,7 @@ import type { ChannelOutboundAdapter, ChannelPlugin } from "../../channels/plugi
 import { setActivePluginRegistry } from "../../plugins/runtime.js";
 import { createTestRegistry } from "../../test-utils/channel-plugins.js";
 import { createIMessageTestPlugin } from "../../test-utils/imessage-test-plugin.js";
+import { GATEWAY_CLIENT_MODES, GATEWAY_CLIENT_NAMES } from "../../utils/message-channel.js";
 import { sendMessage, sendPoll } from "./message.js";
 
 const setRegistry = (registry: ReturnType<typeof createTestRegistry>) => {
@@ -172,6 +173,56 @@ describe("sendPoll channel normalization", () => {
   });
 });
 
+describe("gateway url override hardening", () => {
+  beforeEach(() => {
+    callGatewayMock.mockReset();
+    setRegistry(emptyRegistry);
+  });
+
+  afterEach(() => {
+    setRegistry(emptyRegistry);
+  });
+
+  it("drops gateway url overrides in backend mode (SSRF hardening)", async () => {
+    setRegistry(
+      createTestRegistry([
+        {
+          pluginId: "mattermost",
+          source: "test",
+          plugin: {
+            ...createMattermostLikePlugin({ onSendText: () => {} }),
+            outbound: { deliveryMode: "gateway" },
+          },
+        },
+      ]),
+    );
+
+    callGatewayMock.mockResolvedValueOnce({ messageId: "m1" });
+    await sendMessage({
+      cfg: {},
+      to: "channel:town-square",
+      content: "hi",
+      channel: "mattermost",
+      gateway: {
+        url: "ws://169.254.169.254:80/latest/meta-data/",
+        token: "t",
+        timeoutMs: 5000,
+        clientName: GATEWAY_CLIENT_NAMES.GATEWAY_CLIENT,
+        clientDisplayName: "agent",
+        mode: GATEWAY_CLIENT_MODES.BACKEND,
+      },
+    });
+
+    expect(callGatewayMock).toHaveBeenCalledWith(
+      expect.objectContaining({
+        url: undefined,
+        token: "t",
+        timeoutMs: 5000,
+      }),
+    );
+  });
+});
+
 const emptyRegistry = createTestRegistry([]);
 
 const createMSTeamsOutbound = (opts?: { includePoll?: boolean }): ChannelOutboundAdapter => ({
diff --git a/src/infra/outbound/message.ts b/src/infra/outbound/message.ts
index 6666ab4d249..93d105a331f 100644
--- a/src/infra/outbound/message.ts
+++ b/src/infra/outbound/message.ts
@@ -102,8 +102,15 @@ export type MessagePollResult = {
 };
 
 function resolveGatewayOptions(opts?: MessageGatewayOptions) {
+  // Security: backend callers (tools/agents) must not accept user-controlled gateway URLs.
+  // Use config-derived gateway target only.
+  const url =
+    opts?.mode === GATEWAY_CLIENT_MODES.BACKEND ||
+    opts?.clientName === GATEWAY_CLIENT_NAMES.GATEWAY_CLIENT
+      ? undefined
+      : opts?.url;
   return {
-    url: opts?.url,
+    url,
     token: opts?.token,
     timeoutMs:
       typeof opts?.timeoutMs === "number" && Number.isFinite(opts.timeoutMs)