diff --git a/src/app/login/page.tsx b/src/app/login/page.tsx
index f2c70306f3..664eb3c172 100644
--- a/src/app/login/page.tsx
+++ b/src/app/login/page.tsx
@@ -38,8 +38,7 @@ export default function LoginPage() {
           if (data.nodeVersion) setNodeVersion(data.nodeVersion);
           if (data.nodeCompatible === false) setNodeCompatible(false);
           if (data.authenticated === true || data.requireLogin === false) {
-            router.push("/dashboard");
-            router.refresh();
+            window.location.href = "/dashboard";
             return;
           }
           setHasPassword(!!data.hasPassword);
@@ -77,13 +76,12 @@ export default function LoginPage() {
 
       if (res.ok) {
         sessionStorage.setItem("omniroute_login_time", String(Date.now()));
-        router.push("/dashboard");
-        router.refresh();
+        window.location.href = "/dashboard";
       } else {
         const data = await res.json();
         // (#521) If no password is set, redirect to onboarding instead of showing an error
         if (data.needsSetup) {
-          router.push("/dashboard/onboarding");
+          window.location.href = "/dashboard/onboarding";
           return;
         }
         setError(data.error || t("invalidPassword"));
diff --git a/tests/unit/login-11143.test.ts b/tests/unit/login-11143.test.ts
new file mode 100644
index 0000000000..f55f2edecf
--- /dev/null
+++ b/tests/unit/login-11143.test.ts
@@ -0,0 +1,21 @@
+import assert from "node:assert/strict";
+import { test } from "node:test";
+import fs from "node:fs";
+import path from "node:path";
+
+test("login page performs full window.location navigation after authentication to avoid cookie race", () => {
+  const loginPagePath = path.resolve(process.cwd(), "src/app/login/page.tsx");
+  const content = fs.readFileSync(loginPagePath, "utf8");
+
+  // Ensure router.push("/dashboard") is replaced with window.location.href
+  assert.equal(
+    content.includes('router.push("/dashboard")'),
+    false,
+    "LoginPage should not use router.push('/dashboard') after login"
+  );
+  assert.equal(
+    content.includes('window.location.href = "/dashboard"'),
+    true,
+    "LoginPage must perform full window.location navigation after login"
+  );
+});