diff --git a/src/app/(dashboard)/dashboard/combos/page.tsx b/src/app/(dashboard)/dashboard/combos/page.tsx
index ca3a4e105f..f27a243e81 100644
--- a/src/app/(dashboard)/dashboard/combos/page.tsx
+++ b/src/app/(dashboard)/dashboard/combos/page.tsx
@@ -46,6 +46,7 @@ import {
   normalizeIntelligentRoutingConfig,
 } from "@/lib/combos/intelligentRouting";
 import { resolveServerErrorMessage } from "@/lib/api/serverErrorMessage";
+import { withDashboardCsrfHeader } from "@/shared/utils/dashboardCsrf";
 import { useTranslations } from "next-intl";
 
 const ModelSelectModal = dynamic(() => import("@/shared/components/ModelSelectModal"), {
@@ -866,7 +867,7 @@ export default function CombosPage() {
     try {
       const res = await fetch("/api/combos/test", {
         method: "POST",
-        headers: { "Content-Type": "application/json" },
+        headers: await withDashboardCsrfHeader({ "Content-Type": "application/json" }),
         body: JSON.stringify({ comboName: combo.name }),
       });
       const data = await res.json();
diff --git a/src/app/(dashboard)/dashboard/providers/[id]/__tests__/useModelVisibilityHandlers.test.tsx b/src/app/(dashboard)/dashboard/providers/[id]/__tests__/useModelVisibilityHandlers.test.tsx
index eb5a42a23a..6dce9fa907 100644
--- a/src/app/(dashboard)/dashboard/providers/[id]/__tests__/useModelVisibilityHandlers.test.tsx
+++ b/src/app/(dashboard)/dashboard/providers/[id]/__tests__/useModelVisibilityHandlers.test.tsx
@@ -3,6 +3,8 @@ import React, { act } from "react";
 import { createRoot } from "react-dom/client";
 import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
 
+import { DASHBOARD_CSRF_HEADER } from "@/shared/constants/dashboardCsrf";
+import { __resetDashboardCsrfTokenForTests } from "@/shared/utils/dashboardCsrf";
 import {
   useModelVisibilityHandlers,
   type UseModelVisibilityHandlersReturn,
@@ -70,6 +72,7 @@ beforeEach(() => {
   (
     globalThis as typeof globalThis & { IS_REACT_ACT_ENVIRONMENT?: boolean }
   ).IS_REACT_ACT_ENVIRONMENT = true;
+  __resetDashboardCsrfTokenForTests();
   vi.stubGlobal("fetch", vi.fn());
   vi.clearAllMocks();
 });
@@ -91,14 +94,23 @@ describe("useModelVisibilityHandlers", () => {
 
   it("does not hide a model when a single-model test fails", async () => {
     const fetchMock = vi.mocked(fetch);
-    fetchMock.mockResolvedValueOnce({
-      ok: false,
-      json: () =>
-        Promise.resolve({
-          status: "error",
-          error: "model unavailable",
-        }),
-    } as Response);
+    fetchMock
+      .mockResolvedValueOnce({
+        ok: true,
+        json: () =>
+          Promise.resolve({
+            token: "csrf-token",
+            expiresAt: new Date(Date.now() + 60_000).toISOString(),
+          }),
+      } as Response)
+      .mockResolvedValueOnce({
+        ok: false,
+        json: () =>
+          Promise.resolve({
+            status: "error",
+            error: "model unavailable",
+          }),
+      } as Response);
 
     const hook = renderHook();
 
@@ -108,11 +120,15 @@ describe("useModelVisibilityHandlers", () => {
         .onTestModel("claude-opus-4-8", "anthropic-compatible-cc-test/claude-opus-4-8");
     });
 
-    expect(fetchMock).toHaveBeenCalledTimes(1);
-    expect(fetchMock).toHaveBeenCalledWith(
+    expect(fetchMock).toHaveBeenCalledTimes(2);
+    expect(fetchMock).toHaveBeenNthCalledWith(1, "/api/auth/csrf", expect.any(Object));
+    expect(fetchMock).toHaveBeenNthCalledWith(
+      2,
       "/api/models/test",
       expect.objectContaining({ method: "POST" })
     );
+    const [, modelTestInit] = fetchMock.mock.calls[1];
+    expect((modelTestInit?.headers as Headers).get(DASHBOARD_CSRF_HEADER)).toBe("csrf-token");
     expect(
       fetchMock.mock.calls.some(([url]) => String(url).startsWith("/api/provider-models"))
     ).toBe(false);
diff --git a/src/app/(dashboard)/dashboard/providers/[id]/components/PassthroughModelsSection.tsx b/src/app/(dashboard)/dashboard/providers/[id]/components/PassthroughModelsSection.tsx
index e3dda0a620..4398a114e4 100644
--- a/src/app/(dashboard)/dashboard/providers/[id]/components/PassthroughModelsSection.tsx
+++ b/src/app/(dashboard)/dashboard/providers/[id]/components/PassthroughModelsSection.tsx
@@ -19,6 +19,7 @@ import {
   normalizeModelCatalogSource,
 } from "@/shared/utils/modelCatalogSearch";
 import { useNotificationStore } from "@/store/notificationStore";
+import { withDashboardCsrfHeader } from "@/shared/utils/dashboardCsrf";
 import {
   buildCompatMap,
   providerText,
@@ -158,7 +159,7 @@ export default function PassthroughModelsSection({
           >;
         } = await fetch("/api/models/test-all", {
           method: "POST",
-          headers: { "Content-Type": "application/json" },
+          headers: await withDashboardCsrfHeader({ "Content-Type": "application/json" }),
           // Bug #3610 fix 2: pass autoHideFailed so the server persists the hide
           body: JSON.stringify(
             buildPassthroughTestBody({
diff --git a/src/app/(dashboard)/dashboard/providers/[id]/hooks/useModelVisibilityHandlers.ts b/src/app/(dashboard)/dashboard/providers/[id]/hooks/useModelVisibilityHandlers.ts
index e9283d1b77..7f8f904e89 100644
--- a/src/app/(dashboard)/dashboard/providers/[id]/hooks/useModelVisibilityHandlers.ts
+++ b/src/app/(dashboard)/dashboard/providers/[id]/hooks/useModelVisibilityHandlers.ts
@@ -31,6 +31,7 @@ import {
   type CompatByProtocolMap,
 } from "../providerPageHelpers";
 import { useNotificationStore } from "@/store/notificationStore";
+import { withDashboardCsrfHeader } from "@/shared/utils/dashboardCsrf";
 
 type NotifyStore = ReturnType<typeof useNotificationStore>;
 
@@ -290,7 +291,7 @@ export function useModelVisibilityHandlers({
     try {
       const res = await fetch("/api/models/test", {
         method: "POST",
-        headers: { "Content-Type": "application/json" },
+        headers: await withDashboardCsrfHeader({ "Content-Type": "application/json" }),
         body: JSON.stringify({
           providerId: selectedConnection?.provider || providerNode?.id || providerId,
           modelId: fullModel,
@@ -356,7 +357,7 @@ export function useModelVisibilityHandlers({
               >;
             } = await fetch("/api/models/test-all", {
               method: "POST",
-              headers: { "Content-Type": "application/json" },
+              headers: await withDashboardCsrfHeader({ "Content-Type": "application/json" }),
               body: JSON.stringify({
                 providerId: providerId,
                 connectionId: selectedConnection?.id,
diff --git a/src/app/api/auth/csrf/route.ts b/src/app/api/auth/csrf/route.ts
new file mode 100644
index 0000000000..88fae6c3a2
--- /dev/null
+++ b/src/app/api/auth/csrf/route.ts
@@ -0,0 +1,14 @@
+import { NextResponse } from "next/server";
+
+import { requireManagementAuth } from "@/lib/api/requireManagementAuth";
+import { issueDashboardCsrfToken } from "@/server/authz/csrf";
+
+export async function GET(request: Request) {
+  const authError = await requireManagementAuth(request);
+  if (authError) return authError;
+
+  const issued = issueDashboardCsrfToken(request);
+  return NextResponse.json(issued ?? { token: null, expiresAt: null }, {
+    headers: { "Cache-Control": "no-store" },
+  });
+}
diff --git a/src/server/authz/csrf.ts b/src/server/authz/csrf.ts
new file mode 100644
index 0000000000..d735c1e17e
--- /dev/null
+++ b/src/server/authz/csrf.ts
@@ -0,0 +1,101 @@
+import { createHash, createHmac, timingSafeEqual } from "node:crypto";
+
+import { DASHBOARD_CSRF_HEADER } from "@/shared/constants/dashboardCsrf";
+
+const TOKEN_VERSION = "v1";
+const TOKEN_TTL_SECONDS = 10 * 60;
+const TOKEN_CONTEXT = "omniroute-dashboard-csrf-v1";
+const TEST_MUTATION_PATHS = new Set([
+  "/api/combos/test",
+  "/api/models/test",
+  "/api/models/test-all",
+]);
+
+export interface DashboardCsrfToken {
+  token: string;
+  expiresAt: string;
+}
+
+function getJwtSecret(): Buffer | null {
+  const secret = process.env.JWT_SECRET?.trim();
+  return secret ? Buffer.from(secret, "utf8") : null;
+}
+
+function getCookieValue(request: Request, name: string): string | null {
+  const cookieHeader = request.headers.get("cookie") || request.headers.get("Cookie");
+  if (!cookieHeader) return null;
+
+  for (const segment of cookieHeader.split(";")) {
+    const [rawKey, ...rawValue] = segment.split("=");
+    if (!rawKey || rawValue.length === 0) continue;
+    if (rawKey.trim() === name) return rawValue.join("=").trim() || null;
+  }
+
+  return null;
+}
+
+function sessionHash(authToken: string): string {
+  return createHash("sha256").update(authToken).digest("base64url");
+}
+
+function csrfMac(secret: Buffer, expiresAtSeconds: number, authToken: string): Buffer {
+  return createHmac("sha256", secret)
+    .update(TOKEN_CONTEXT)
+    .update("\n")
+    .update(String(expiresAtSeconds))
+    .update("\n")
+    .update(sessionHash(authToken))
+    .digest();
+}
+
+export function issueDashboardCsrfToken(
+  request: Request,
+  nowMs: number = Date.now()
+): DashboardCsrfToken | null {
+  const secret = getJwtSecret();
+  const authToken = getCookieValue(request, "auth_token");
+  if (!secret || !authToken) return null;
+
+  const expiresAtSeconds = Math.floor(nowMs / 1000) + TOKEN_TTL_SECONDS;
+  const mac = csrfMac(secret, expiresAtSeconds, authToken).toString("base64url");
+
+  return {
+    token: `${TOKEN_VERSION}.${expiresAtSeconds}.${mac}`,
+    expiresAt: new Date(expiresAtSeconds * 1000).toISOString(),
+  };
+}
+
+function requestPathname(request: Request): string | null {
+  try {
+    return new URL(request.url).pathname;
+  } catch {
+    return null;
+  }
+}
+
+export function validateDashboardCsrfToken(request: Request, nowMs: number = Date.now()): boolean {
+  const pathname = requestPathname(request);
+  if (!pathname || !TEST_MUTATION_PATHS.has(pathname)) return false;
+
+  const secret = getJwtSecret();
+  const authToken = getCookieValue(request, "auth_token");
+  const rawToken = request.headers.get(DASHBOARD_CSRF_HEADER);
+  if (!secret || !authToken || !rawToken) return false;
+
+  const [version, rawExpiresAt, rawMac, ...extra] = rawToken.split(".");
+  if (extra.length > 0 || version !== TOKEN_VERSION || !rawExpiresAt || !rawMac) return false;
+
+  const expiresAtSeconds = Number(rawExpiresAt);
+  const nowSeconds = Math.floor(nowMs / 1000);
+  if (!Number.isSafeInteger(expiresAtSeconds) || expiresAtSeconds < nowSeconds) return false;
+
+  let providedMac: Buffer;
+  try {
+    providedMac = Buffer.from(rawMac, "base64url");
+  } catch {
+    return false;
+  }
+
+  const expectedMac = csrfMac(secret, expiresAtSeconds, authToken);
+  return providedMac.length === expectedMac.length && timingSafeEqual(providedMac, expectedMac);
+}
diff --git a/src/server/authz/pipeline.ts b/src/server/authz/pipeline.ts
index 72257947ec..d05567fd52 100644
--- a/src/server/authz/pipeline.ts
+++ b/src/server/authz/pipeline.ts
@@ -7,6 +7,7 @@ import { generateRequestId } from "../../shared/utils/requestId";
 import { applyCorsHeaders } from "../cors/origins";
 import { validateBrowserMutationOrigin } from "../origin/publicOrigin";
 import { classifyRoute } from "./classify";
+import { validateDashboardCsrfToken } from "./csrf";
 import { classifyStampedPeerLocality } from "./peerStamp";
 import { clientApiPolicy } from "./policies/clientApi";
 import { managementPolicy } from "./policies/management";
@@ -329,7 +330,7 @@ export async function runAuthzPipeline(
     isUnsafeMutationMethod(method)
   ) {
     const originVerdict = validateBrowserMutationOrigin(request);
-    if (!originVerdict.ok) {
+    if (!originVerdict.ok && !validateDashboardCsrfToken(request)) {
       const rejection = invalidOriginResponse(requestId);
       rejection.headers.set(AUTHZ_HEADER_ROUTE_CLASS, classification.routeClass);
       applyCorsHeaders(rejection, request);
diff --git a/src/shared/constants/dashboardCsrf.ts b/src/shared/constants/dashboardCsrf.ts
new file mode 100644
index 0000000000..f340f4292e
--- /dev/null
+++ b/src/shared/constants/dashboardCsrf.ts
@@ -0,0 +1 @@
+export const DASHBOARD_CSRF_HEADER = "x-omniroute-csrf";
diff --git a/src/shared/utils/dashboardCsrf.ts b/src/shared/utils/dashboardCsrf.ts
new file mode 100644
index 0000000000..6b3747bdfe
--- /dev/null
+++ b/src/shared/utils/dashboardCsrf.ts
@@ -0,0 +1,56 @@
+import { DASHBOARD_CSRF_HEADER } from "@/shared/constants/dashboardCsrf";
+
+interface CachedDashboardCsrfToken {
+  token: string;
+  expiresAtMs: number;
+}
+
+let cachedToken: CachedDashboardCsrfToken | null = null;
+
+export function __resetDashboardCsrfTokenForTests(): void {
+  cachedToken = null;
+}
+
+async function getDashboardCsrfToken(): Promise<string | null> {
+  const now = Date.now();
+  if (cachedToken && cachedToken.expiresAtMs - now > 30_000) {
+    return cachedToken.token;
+  }
+
+  let response: Response;
+  try {
+    response = await fetch("/api/auth/csrf", {
+      cache: "no-store",
+      credentials: "same-origin",
+    });
+  } catch {
+    return null;
+  }
+  if (!response.ok) return null;
+
+  const body = (await response.json().catch(() => null)) as {
+    token?: unknown;
+    expiresAt?: unknown;
+  } | null;
+
+  if (typeof body?.token !== "string" || typeof body.expiresAt !== "string") {
+    cachedToken = null;
+    return null;
+  }
+
+  const expiresAtMs = Date.parse(body.expiresAt);
+  if (!Number.isFinite(expiresAtMs) || expiresAtMs <= now) {
+    cachedToken = null;
+    return null;
+  }
+
+  cachedToken = { token: body.token, expiresAtMs };
+  return cachedToken.token;
+}
+
+export async function withDashboardCsrfHeader(headers?: HeadersInit): Promise<Headers> {
+  const result = new Headers(headers);
+  const token = await getDashboardCsrfToken();
+  if (token) result.set(DASHBOARD_CSRF_HEADER, token);
+  return result;
+}
diff --git a/tests/unit/authz/csrf.test.ts b/tests/unit/authz/csrf.test.ts
new file mode 100644
index 0000000000..eff1120e42
--- /dev/null
+++ b/tests/unit/authz/csrf.test.ts
@@ -0,0 +1,86 @@
+import assert from "node:assert/strict";
+import { describe, it, beforeEach, after } from "node:test";
+
+import { DASHBOARD_CSRF_HEADER } from "@/shared/constants/dashboardCsrf";
+import { issueDashboardCsrfToken, validateDashboardCsrfToken } from "@/server/authz/csrf";
+
+const ORIGINAL_JWT_SECRET = process.env.JWT_SECRET;
+
+beforeEach(() => {
+  process.env.JWT_SECRET = "csrf-test-secret";
+});
+
+after(() => {
+  if (ORIGINAL_JWT_SECRET === undefined) delete process.env.JWT_SECRET;
+  else process.env.JWT_SECRET = ORIGINAL_JWT_SECRET;
+});
+
+function request(path: string, cookie = "auth_token=session-a", token?: string): Request {
+  return new Request(`http://127.0.0.1:20128${path}`, {
+    method: "POST",
+    headers: {
+      cookie,
+      ...(token ? { [DASHBOARD_CSRF_HEADER]: token } : {}),
+    },
+  });
+}
+
+describe("dashboard CSRF tokens", () => {
+  it("accepts a valid token for dashboard test mutation paths", () => {
+    const issued = issueDashboardCsrfToken(request("/api/auth/csrf"), 1_000);
+
+    assert.ok(issued);
+    assert.equal(
+      validateDashboardCsrfToken(request("/api/models/test", undefined, issued.token), 1_000),
+      true
+    );
+    assert.equal(
+      validateDashboardCsrfToken(request("/api/models/test-all", undefined, issued.token), 1_000),
+      true
+    );
+    assert.equal(
+      validateDashboardCsrfToken(request("/api/combos/test", undefined, issued.token), 1_000),
+      true
+    );
+  });
+
+  it("rejects tokens on non-test management paths", () => {
+    const issued = issueDashboardCsrfToken(request("/api/auth/csrf"), 1_000);
+
+    assert.ok(issued);
+    assert.equal(
+      validateDashboardCsrfToken(request("/api/keys", undefined, issued.token), 1_000),
+      false
+    );
+  });
+
+  it("binds tokens to the dashboard auth cookie", () => {
+    const issued = issueDashboardCsrfToken(
+      request("/api/auth/csrf", "auth_token=session-a"),
+      1_000
+    );
+
+    assert.ok(issued);
+    assert.equal(
+      validateDashboardCsrfToken(
+        request("/api/models/test", "auth_token=session-b", issued.token),
+        1_000
+      ),
+      false
+    );
+  });
+
+  it("rejects expired and tampered tokens", () => {
+    const issued = issueDashboardCsrfToken(request("/api/auth/csrf"), 1_000);
+
+    assert.ok(issued);
+    assert.equal(
+      validateDashboardCsrfToken(request("/api/models/test", undefined, issued.token), 700_000),
+      false
+    );
+    assert.equal(
+      validateDashboardCsrfToken(request("/api/models/test", undefined, `${issued.token}x`), 1_000),
+      false
+    );
+  });
+});
diff --git a/tests/unit/authz/pipeline.test.ts b/tests/unit/authz/pipeline.test.ts
index ab740146da..f2c0dbae5e 100644
--- a/tests/unit/authz/pipeline.test.ts
+++ b/tests/unit/authz/pipeline.test.ts
@@ -14,6 +14,8 @@ const core = await import("../../../src/lib/db/core.ts");
 const apiKeysDb = await import("../../../src/lib/db/apiKeys.ts");
 const settingsDb = await import("../../../src/lib/db/settings.ts");
 const pipeline = await import("../../../src/server/authz/pipeline.ts");
+const csrf = await import("../../../src/server/authz/csrf.ts");
+const dashboardCsrfConstants = await import("../../../src/shared/constants/dashboardCsrf.ts");
 
 const ORIGINAL_JWT = process.env.JWT_SECRET;
 const ORIGINAL_INITIAL = process.env.INITIAL_PASSWORD;
@@ -323,6 +325,94 @@ test("runAuthzPipeline accepts dashboard mutations from configured public origin
   assert.equal(response.headers.get("x-omniroute-route-class"), "MANAGEMENT");
 });
 
+test("runAuthzPipeline rejects dashboard test mutations from dynamic public origins without CSRF", async () => {
+  await forceAuthRequired();
+
+  const response = await pipeline.runAuthzPipeline(
+    request("http://127.0.0.1:20128/api/models/test", {
+      method: "POST",
+      headers: {
+        cookie: await dashboardCookie(),
+        host: "127.0.0.1:20128",
+        origin: "https://random-tunnel.example.test",
+        "content-type": "application/json",
+        "sec-fetch-site": "same-origin",
+      },
+      body: "{}",
+    }),
+    { enforce: true }
+  );
+  const body = await response.json();
+
+  assert.equal(response.status, 403);
+  assert.equal(body.error.code, "INVALID_ORIGIN");
+});
+
+test("runAuthzPipeline accepts dashboard test mutations from dynamic public origins with CSRF", async () => {
+  await forceAuthRequired();
+
+  const cookie = await dashboardCookie();
+  const issued = csrf.issueDashboardCsrfToken(
+    request("http://127.0.0.1:20128/api/auth/csrf", {
+      headers: { cookie },
+    })
+  );
+  assert.ok(issued);
+
+  for (const path of ["/api/combos/test", "/api/models/test", "/api/models/test-all"]) {
+    const response = await pipeline.runAuthzPipeline(
+      request(`http://127.0.0.1:20128${path}`, {
+        method: "POST",
+        headers: {
+          cookie,
+          host: "127.0.0.1:20128",
+          origin: "https://random-tunnel.example.test",
+          "content-type": "application/json",
+          [dashboardCsrfConstants.DASHBOARD_CSRF_HEADER]: issued.token,
+          "sec-fetch-site": "same-origin",
+        },
+        body: "{}",
+      }),
+      { enforce: true }
+    );
+
+    assert.equal(response.status, 200, path);
+    assert.equal(response.headers.get("x-omniroute-route-class"), "MANAGEMENT");
+  }
+});
+
+test("runAuthzPipeline keeps non-test management mutations pinned to known origins with CSRF", async () => {
+  await forceAuthRequired();
+
+  const cookie = await dashboardCookie();
+  const issued = csrf.issueDashboardCsrfToken(
+    request("http://127.0.0.1:20128/api/auth/csrf", {
+      headers: { cookie },
+    })
+  );
+  assert.ok(issued);
+
+  const response = await pipeline.runAuthzPipeline(
+    request("http://127.0.0.1:20128/api/keys", {
+      method: "POST",
+      headers: {
+        cookie,
+        host: "127.0.0.1:20128",
+        origin: "https://random-tunnel.example.test",
+        "content-type": "application/json",
+        [dashboardCsrfConstants.DASHBOARD_CSRF_HEADER]: issued.token,
+        "sec-fetch-site": "same-origin",
+      },
+      body: "{}",
+    }),
+    { enforce: true }
+  );
+  const body = await response.json();
+
+  assert.equal(response.status, 403);
+  assert.equal(body.error.code, "INVALID_ORIGIN");
+});
+
 test("runAuthzPipeline rejects dashboard mutations from invalid browser origin", async () => {
   await forceAuthRequired();
   process.env.NEXT_PUBLIC_BASE_URL = "https://gateway.example.test";