diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6e65f84dd19..f3682948496 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -36,6 +36,7 @@ Docs: https://docs.openclaw.ai
 - CLI/Claude: verify stored Claude CLI session ids have a readable project transcript before resuming, clearing phantom bindings with `reason=transcript-missing` instead of silently starting fresh under `--resume`. Fixes #70177.
 - CLI sessions: persist CLI session clearing through the atomic session-store merge path, so expired Claude/Codex CLI bindings are actually removed before retrying without the stale session id. (#70298) Thanks @HFConsultant.
 - ACP/sessions_spawn: honor explicit `model` overrides for ACP child sessions instead of silently falling back to the target agent default model. (#70210) Thanks @felix-miao.
+- Diffs/viewer: re-read remote viewer access policy from live runtime config on each request, so toggling `plugins.entries.diffs.config.security.allowRemoteViewer` closes proxied viewer access immediately instead of waiting for a restart. Thanks @vincentkoc.
 - Agents/subagents: drop bare `NO_REPLY` from the parent turn when the session still has pending spawned children, so direct-conversation surfaces such as Telegram DMs no longer rewrite the sentinel into visible fallback chatter while waiting for the child completion event. (#69942) Thanks @neeravmakwana.
 - Plugins/install: keep bundled plugin dependencies off npm install while repairing them when plugins activate from a packaged install, including Feishu/Lark, Browser, and direct bundled channel setup-entry loads.
 - Memory/LanceDB: retry initialization after a failed LanceDB load and report unsupported Intel macOS native runtime clearly instead of caching the failure or repeatedly attempting an install that cannot work.
diff --git a/extensions/diffs/src/browser.test.ts b/extensions/diffs/src/browser.test.ts
index fd02bb8786b..502a70df4d2 100644
--- a/extensions/diffs/src/browser.test.ts
+++ b/extensions/diffs/src/browser.test.ts
@@ -192,7 +192,7 @@ describe("PlaywrightDiffScreenshotter", () => {
 });
 
 describe("diffs plugin registration", () => {
-  it("applies plugin-config defaults through registered tool and viewer handler", async () => {
+  it("uses live runtime viewer-access config through the registered HTTP handler", async () => {
     type RegisteredTool = {
       execute?: (toolCallId: string, params: Record<string, unknown>) => Promise<unknown>;
     };
@@ -207,6 +207,23 @@ describe("diffs plugin registration", () => {
       | undefined;
     let registeredHttpRouteHandler: HttpRouteHandler | undefined;
     const on = vi.fn();
+    let configFile: OpenClawConfig = {
+      gateway: {
+        port: 18789,
+        bind: "loopback",
+      },
+      plugins: {
+        entries: {
+          diffs: {
+            config: {
+              security: {
+                allowRemoteViewer: true,
+              },
+            },
+          },
+        },
+      },
+    } as OpenClawConfig;
 
     const api = createTestPluginApi({
       id: "diffs",
@@ -233,7 +250,11 @@ describe("diffs plugin registration", () => {
           allowRemoteViewer: true,
         },
       },
-      runtime: {} as never,
+      runtime: {
+        config: {
+          loadConfig: () => configFile,
+        },
+      } as never,
       registerTool(tool: Parameters<OpenClawPluginApi["registerTool"]>[0]) {
         registeredToolFactory = typeof tool === "function" ? tool : () => tool;
       },
@@ -293,6 +314,21 @@ describe("diffs plugin registration", () => {
       },
     );
 
+    configFile = {
+      ...configFile,
+      plugins: {
+        entries: {
+          diffs: {
+            config: {
+              security: {
+                allowRemoteViewer: false,
+              },
+            },
+          },
+        },
+      },
+    } as OpenClawConfig;
+
     const proxiedRes = createMockServerResponse();
     const proxiedHandled = await registeredHttpRouteHandler?.(
       localReq({
@@ -306,7 +342,7 @@ describe("diffs plugin registration", () => {
     );
 
     expect(proxiedHandled).toBe(true);
-    expect(proxiedRes.statusCode).toBe(200);
+    expect(proxiedRes.statusCode).toBe(404);
   });
 });
 
diff --git a/extensions/diffs/src/http.ts b/extensions/diffs/src/http.ts
index a4158ac3d3d..4033faf1436 100644
--- a/extensions/diffs/src/http.ts
+++ b/extensions/diffs/src/http.ts
@@ -29,6 +29,11 @@ export function createDiffsHttpHandler(params: {
   allowRemoteViewer?: boolean;
   trustedProxies?: readonly string[];
   allowRealIpFallback?: boolean;
+  resolveAccessConfig?: () => {
+    allowRemoteViewer?: boolean;
+    trustedProxies?: readonly string[];
+    allowRealIpFallback?: boolean;
+  };
 }) {
   const viewerFailureLimiter = new ViewerFailureLimiter();
 
@@ -46,11 +51,16 @@ export function createDiffsHttpHandler(params: {
       return false;
     }
 
-    const access = resolveViewerAccess(req, {
+    const accessConfig = params.resolveAccessConfig?.() ?? {
+      allowRemoteViewer: params.allowRemoteViewer,
       trustedProxies: params.trustedProxies,
       allowRealIpFallback: params.allowRealIpFallback,
+    };
+    const access = resolveViewerAccess(req, {
+      trustedProxies: accessConfig.trustedProxies,
+      allowRealIpFallback: accessConfig.allowRealIpFallback,
     });
-    if (!access.localRequest && params.allowRemoteViewer !== true) {
+    if (!access.localRequest && accessConfig.allowRemoteViewer !== true) {
       respondText(res, 404, "Diff not found");
       return true;
     }
diff --git a/extensions/diffs/src/plugin.ts b/extensions/diffs/src/plugin.ts
index 7cb7ec7fa0f..d58b180fb41 100644
--- a/extensions/diffs/src/plugin.ts
+++ b/extensions/diffs/src/plugin.ts
@@ -1,4 +1,5 @@
 import path from "node:path";
+import { resolvePluginConfigObject } from "openclaw/plugin-sdk/config-runtime";
 import { resolvePreferredOpenClawTmpDir, type OpenClawPluginApi } from "../api.js";
 import {
   resolveDiffsPluginDefaults,
@@ -12,12 +13,20 @@ import { createDiffsTool } from "./tool.js";
 
 export function registerDiffsPlugin(api: OpenClawPluginApi): void {
   const defaults = resolveDiffsPluginDefaults(api.pluginConfig);
-  const security = resolveDiffsPluginSecurity(api.pluginConfig);
   const viewerBaseUrl = resolveDiffsPluginViewerBaseUrl(api.pluginConfig);
   const store = new DiffArtifactStore({
     rootDir: path.join(resolvePreferredOpenClawTmpDir(), "openclaw-diffs"),
     logger: api.logger,
   });
+  const resolveCurrentAccessConfig = () => {
+    const currentConfig = api.runtime.config?.loadConfig?.() ?? api.config;
+    const pluginConfig = resolvePluginConfigObject(currentConfig, "diffs") ?? api.pluginConfig;
+    return {
+      allowRemoteViewer: resolveDiffsPluginSecurity(pluginConfig).allowRemoteViewer,
+      trustedProxies: currentConfig.gateway?.trustedProxies,
+      allowRealIpFallback: currentConfig.gateway?.allowRealIpFallback === true,
+    };
+  };
 
   api.registerTool(
     (ctx) => createDiffsTool({ api, store, defaults, viewerBaseUrl, context: ctx }),
@@ -32,9 +41,10 @@ export function registerDiffsPlugin(api: OpenClawPluginApi): void {
     handler: createDiffsHttpHandler({
       store,
       logger: api.logger,
-      allowRemoteViewer: security.allowRemoteViewer,
+      allowRemoteViewer: resolveDiffsPluginSecurity(api.pluginConfig).allowRemoteViewer,
       trustedProxies: api.config.gateway?.trustedProxies,
       allowRealIpFallback: api.config.gateway?.allowRealIpFallback === true,
+      resolveAccessConfig: resolveCurrentAccessConfig,
     }),
   });
   api.on("before_prompt_build", async () => ({
diff --git a/src/plugins/contracts/boundary-invariants.test.ts b/src/plugins/contracts/boundary-invariants.test.ts
index 2cb8fd6138e..44b71bd515d 100644
--- a/src/plugins/contracts/boundary-invariants.test.ts
+++ b/src/plugins/contracts/boundary-invariants.test.ts
@@ -51,6 +51,10 @@ const BUNDLED_LIVE_CONFIG_HOOK_GUARDS = {
     'resolvePluginConfigObject(api.runtime.config.loadConfig(), "active-memory")',
     "api.runtime.config.loadConfig()",
   ],
+  "extensions/diffs/src/plugin.ts": [
+    'resolvePluginConfigObject(currentConfig, "diffs")',
+    "api.runtime.config?.loadConfig?.() ?? api.config",
+  ],
   "extensions/memory-core/src/dreaming.ts": [
     'params.reason === "runtime"',
     "resolveMemoryCorePluginConfig(startupCfg)",