diff --git a/.vs/slnx.sqlite b/.vs/slnx.sqlite
deleted file mode 100644
index 2891048dc..000000000
Binary files a/.vs/slnx.sqlite and /dev/null differ
diff --git a/package-lock.json b/package-lock.json
index 5f90efb72..27fef4d40 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -13,7 +13,7 @@
         "@azure/cosmos": "4.7.0",
         "@azure/cosmos-language-service": "0.0.5",
         "@azure/identity": "4.5.0",
-        "@azure/msal-browser": "2.14.2",
+        "@azure/msal-browser": "^5.2.0",
         "@babel/plugin-proposal-class-properties": "7.12.1",
         "@babel/plugin-proposal-decorators": "7.12.12",
         "@fluentui/react": "8.119.0",
@@ -590,21 +590,22 @@
       "license": "0BSD"
     },
     "node_modules/@azure/msal-browser": {
-      "version": "2.14.2",
+      "version": "5.6.0",
+      "resolved": "https://registry.npmjs.org/@azure/msal-browser/-/msal-browser-5.6.0.tgz",
+      "integrity": "sha512-LLqyAtpQNfnATQKnplg/dKJaigxGaaMPrp003ZWGnWwsAmmtzk7xcHEVykCu/4FMyyIfn66NPPzxS9DHrg/UOA==",
       "license": "MIT",
       "dependencies": {
-        "@azure/msal-common": "^4.3.0"
+        "@azure/msal-common": "16.4.0"
       },
       "engines": {
         "node": ">=0.8.0"
       }
     },
     "node_modules/@azure/msal-common": {
-      "version": "4.5.1",
+      "version": "16.4.0",
+      "resolved": "https://registry.npmjs.org/@azure/msal-common/-/msal-common-16.4.0.tgz",
+      "integrity": "sha512-twXt09PYtj1PffNNIAzQlrBd0DS91cdA6i1gAfzJ6BnPM4xNk5k9q/5xna7jLIjU3Jnp0slKYtucshGM8OGNAw==",
       "license": "MIT",
-      "dependencies": {
-        "debug": "^4.1.1"
-      },
       "engines": {
         "node": ">=0.8.0"
       }
@@ -15860,6 +15861,7 @@
       "version": "2.3.2",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.2.tgz",
       "integrity": "sha512-xiqMQR4xAeHTuB9uWm+fFRcIOgKBMiOBP+eXiyT7jsgVCq1bkVygt00oASowB7EdtpOHaaPgKt812P9ab+DDKA==",
+      "dev": true,
       "hasInstallScript": true,
       "optional": true,
       "os": [
diff --git a/package.json b/package.json
index 9a34e6a5c..5e71c1b74 100644
--- a/package.json
+++ b/package.json
@@ -8,7 +8,7 @@
     "@azure/cosmos": "4.7.0",
     "@azure/cosmos-language-service": "0.0.5",
     "@azure/identity": "4.5.0",
-    "@azure/msal-browser": "2.14.2",
+    "@azure/msal-browser": "^5.2.0",
     "@babel/plugin-proposal-class-properties": "7.12.1",
     "@babel/plugin-proposal-decorators": "7.12.12",
     "@fluentui/react": "8.119.0",
diff --git a/src/Explorer/Explorer.tsx b/src/Explorer/Explorer.tsx
index 55553b852..95b58b108 100644
--- a/src/Explorer/Explorer.tsx
+++ b/src/Explorer/Explorer.tsx
@@ -280,7 +280,7 @@ export default class Explorer {
         updateUserContext({ aadToken: aadToken });
         useDataPlaneRbac.setState({ aadTokenUpdated: true });
       } catch (error) {
-        if (error instanceof msal.AuthError && error.errorCode === msal.BrowserAuthErrorMessage.popUpWindowError.code) {
+        if (error instanceof msal.AuthError && error.errorCode === msal.BrowserAuthErrorCodes.popupWindowError) {
           logConsoleError(
             "We were unable to establish authorization for this account, due to pop-ups being disabled in the browser.\nPlease enable pop-ups for this site and try again",
           );
diff --git a/src/Explorer/Panes/SettingsPane/SettingsPane.tsx b/src/Explorer/Panes/SettingsPane/SettingsPane.tsx
index d6324d52b..5b2806648 100644
--- a/src/Explorer/Panes/SettingsPane/SettingsPane.tsx
+++ b/src/Explorer/Panes/SettingsPane/SettingsPane.tsx
@@ -1,7 +1,4 @@
-import {
-  AuthError as msalAuthError,
-  BrowserAuthErrorMessage as msalBrowserAuthErrorMessage,
-} from "@azure/msal-browser";
+import { AuthError as msalAuthError, BrowserAuthErrorCodes as msalBrowserAuthErrorCodes } from "@azure/msal-browser";
 import {
   Checkbox,
   ChoiceGroup,
@@ -305,7 +302,7 @@ export const SettingsPane: FunctionComponent<{ explorer: Explorer }> = ({
         } catch (authError) {
           if (
             authError instanceof msalAuthError &&
-            authError.errorCode === msalBrowserAuthErrorMessage.popUpWindowError.code
+            authError.errorCode === msalBrowserAuthErrorCodes.popupWindowError
           ) {
             logConsoleError(t(Keys.panes.settings.popupsDisabledError));
           } else {
diff --git a/src/Utils/AuthorizationUtils.test.ts b/src/Utils/AuthorizationUtils.test.ts
index 96250a9a5..993b6b166 100644
--- a/src/Utils/AuthorizationUtils.test.ts
+++ b/src/Utils/AuthorizationUtils.test.ts
@@ -1,12 +1,14 @@
 import { AuthType } from "../AuthType";
 import * as Constants from "../Common/Constants";
-import { resetConfigContext, updateConfigContext } from "../ConfigContext";
+import { resetConfigContext } from "../ConfigContext";
 import { ApiType, updateUserContext, userContext } from "../UserContext";
 import * as AuthorizationUtils from "./AuthorizationUtils";
 jest.mock("../Explorer/Explorer");
 jest.mock("@azure/msal-browser", () => ({
   PublicClientApplication: jest.fn().mockImplementation((config) => ({
     _config: config,
+    initialize: jest.fn().mockResolvedValue(undefined),
+    handleRedirectPromise: jest.fn().mockResolvedValue(null),
   })),
 }));
 
@@ -138,41 +140,27 @@ describe("AuthorizationUtils", () => {
   });
 
   describe("getMsalInstance()", () => {
-    const originalHostname = window.location.hostname;
+    const originalNodeEnv = process.env.NODE_ENV;
 
     afterEach(() => {
+      process.env.NODE_ENV = originalNodeEnv;
       resetConfigContext();
-      Object.defineProperty(window, "location", {
-        value: { ...window.location, hostname: originalHostname },
-        writable: true,
-      });
     });
 
-    it("should use configContext.msalRedirectURI when set", async () => {
-      updateConfigContext({ msalRedirectURI: "https://dataexplorer-preview.azurewebsites.net/" });
+    it("should use dev redirect bridge URL in development mode", async () => {
+      process.env.NODE_ENV = "development";
       const instance = await AuthorizationUtils.getMsalInstance();
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      expect((instance as any)._config.auth.redirectUri).toBe("https://dataexplorer-preview.azurewebsites.net/");
+      expect((instance as any)._config.auth.redirectUri).toBe(
+        "https://dataexplorer-dev.azurewebsites.net/redirectBridge.html",
+      );
     });
 
-    it("should use dev redirect URI on localhost", async () => {
-      Object.defineProperty(window, "location", {
-        value: { ...window.location, hostname: "localhost" },
-        writable: true,
-      });
+    it("should use origin-based redirect bridge URL in production", async () => {
+      process.env.NODE_ENV = "production";
       const instance = await AuthorizationUtils.getMsalInstance();
       // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      expect((instance as any)._config.auth.redirectUri).toBe("https://dataexplorer-dev.azurewebsites.net");
-    });
-
-    it("should not set redirect URI in non-localhost production", async () => {
-      Object.defineProperty(window, "location", {
-        value: { ...window.location, hostname: "cosmos.azure.com" },
-        writable: true,
-      });
-      const instance = await AuthorizationUtils.getMsalInstance();
-      // eslint-disable-next-line @typescript-eslint/no-explicit-any
-      expect((instance as any)._config.auth.redirectUri).toBeUndefined();
+      expect((instance as any)._config.auth.redirectUri).toBe("http://localhost/redirectBridge.html");
     });
   });
 });
diff --git a/src/Utils/AuthorizationUtils.ts b/src/Utils/AuthorizationUtils.ts
index a3ba22107..14fd7c04c 100644
--- a/src/Utils/AuthorizationUtils.ts
+++ b/src/Utils/AuthorizationUtils.ts
@@ -51,6 +51,12 @@ export function decryptJWTToken(token: string) {
 }
 
 export async function getMsalInstance() {
+  // Compute the redirect bridge URL for MSAL v5 COOP handling
+  const redirectBridgeUrl =
+    process.env.NODE_ENV === "development"
+      ? "https://dataexplorer-dev.azurewebsites.net/redirectBridge.html"
+      : `${window.location.origin}/redirectBridge.html`;
+
   const msalConfig: msal.Configuration = {
     cache: {
       cacheLocation: "localStorage",
@@ -58,16 +64,16 @@ export async function getMsalInstance() {
     auth: {
       authority: `${configContext.AAD_ENDPOINT}organizations`,
       clientId: "203f1145-856a-4232-83d4-a43568fba23d",
+      // MSAL v5 requires redirect bridge for popup/silent flows
+      redirectUri: redirectBridgeUrl,
     },
   };
 
-  if (configContext.msalRedirectURI) {
-    msalConfig.auth.redirectUri = configContext.msalRedirectURI;
-  } else if (process.env.NODE_ENV === "development" || window.location.hostname === "localhost") {
-    msalConfig.auth.redirectUri = "https://dataexplorer-dev.azurewebsites.net";
-  }
-
   const msalInstance = new msal.PublicClientApplication(msalConfig);
+  // v3+ requires explicit initialization before using MSAL APIs
+  await msalInstance.initialize();
+  // Handle any redirect response (e.g., after logoutRedirect) to clear interaction state
+  await msalInstance.handleRedirectPromise();
   return msalInstance;
 }
 
diff --git a/src/hooks/useAADAuth.ts b/src/hooks/useAADAuth.ts
index 6a927dca0..062455793 100644
--- a/src/hooks/useAADAuth.ts
+++ b/src/hooks/useAADAuth.ts
@@ -58,10 +58,15 @@ export function useAADAuth(config?: ConfigContext): ReturnType {
     if (!msalInstance || !config) {
       return;
     }
+    // Use redirect bridge for MSAL v5 COOP handling
+    const redirectBridgeUrl =
+      process.env.NODE_ENV === "development"
+        ? "https://dataexplorer-dev.azurewebsites.net/redirectBridge.html"
+        : `${window.location.origin}/redirectBridge.html`;
 
     try {
       const response = await msalInstance.loginPopup({
-        redirectUri: config.msalRedirectURI,
+        redirectUri: redirectBridgeUrl,
         scopes: [],
       });
       setLoggedIn();
@@ -81,7 +86,12 @@ export function useAADAuth(config?: ConfigContext): ReturnType {
     }
     setLoggedOut();
     localStorage.removeItem("cachedTenantId");
-    msalInstance.logoutRedirect();
+    // Redirect back to the hosted explorer after logout
+    const postLogoutRedirectUri =
+      process.env.NODE_ENV === "development"
+        ? "https://dataexplorer-dev.azurewebsites.net/hostedExplorer.html"
+        : `${window.location.origin}`;
+    msalInstance.logoutRedirect({ postLogoutRedirectUri });
   }, [msalInstance]);
 
   const switchTenant = React.useCallback(
@@ -89,9 +99,14 @@ export function useAADAuth(config?: ConfigContext): ReturnType {
       if (!msalInstance || !config) {
         return;
       }
+      // Use redirect bridge for MSAL v5 COOP handling
+      const redirectBridgeUrl =
+        process.env.NODE_ENV === "development"
+          ? "https://dataexplorer-dev.azurewebsites.net/redirectBridge.html"
+          : `${window.location.origin}/redirectBridge.html`;
       try {
         const response = await msalInstance.loginPopup({
-          redirectUri: config.msalRedirectURI,
+          redirectUri: redirectBridgeUrl,
           authority: `${config.AAD_ENDPOINT}${id}`,
           scopes: [],
         });
@@ -120,7 +135,7 @@ export function useAADAuth(config?: ConfigContext): ReturnType {
       setArmToken(armToken);
       setAuthFailure(null);
     } catch (error) {
-      if (error instanceof msal.AuthError && error.errorCode === msal.BrowserAuthErrorMessage.popUpWindowError.code) {
+      if (error instanceof msal.AuthError && error.errorCode === msal.BrowserAuthErrorCodes.popupWindowError) {
         // This error can occur when acquireTokenWithMsal() has attempted to acquire token interactively
         // and user has popups disabled in browser. This fails as the popup is not the result of a explicit user
         // action. In this case, we display the failure and a link to repeat the operation. Clicking on the
diff --git a/src/redirectBridge.html b/src/redirectBridge.html
new file mode 100644
index 000000000..7f4ada149
--- /dev/null
+++ b/src/redirectBridge.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Authentication Redirect</title>
+  </head>
+  <body>
+    <!-- MSAL COOP Redirect Bridge - handles auth response from Identity Provider -->
+    <div id="redirect-container">
+      <p>Processing authentication...</p>
+    </div>
+  </body>
+</html>
diff --git a/src/redirectBridge.ts b/src/redirectBridge.ts
new file mode 100644
index 000000000..946d0975a
--- /dev/null
+++ b/src/redirectBridge.ts
@@ -0,0 +1,15 @@
+/**
+ * MSAL COOP Redirect Bridge
+ *
+ * This page handles the authentication response from the Identity Provider (IdP)
+ * and broadcasts it to the main application frame. Required for msal-browser v5+
+ * to securely handle auth responses when the IdP sets Cross-Origin-Opener-Policy headers.
+ *
+ * Security Note: This file must be bundled with your application, NOT loaded from a CDN.
+ *
+ */
+import { broadcastResponseToMainFrame } from "@azure/msal-browser/redirect-bridge";
+
+broadcastResponseToMainFrame().catch((error: unknown) => {
+  console.error("MSAL redirect bridge error:", error);
+});
diff --git a/src/types/msal-browser-redirect-bridge.d.ts b/src/types/msal-browser-redirect-bridge.d.ts
new file mode 100644
index 000000000..33d10d4a5
--- /dev/null
+++ b/src/types/msal-browser-redirect-bridge.d.ts
@@ -0,0 +1,11 @@
+// Type declarations for @azure/msal-browser subpath exports
+// Required because tsconfig uses moduleResolution: "node" which doesn't support exports field
+
+declare module "@azure/msal-browser/redirect-bridge" {
+  /**
+   * Processes the authentication response from the redirect URL.
+   * For SSO and popup scenarios broadcasts it to the main frame.
+   * For redirect scenario navigates to the home page.
+   */
+  export function broadcastResponseToMainFrame(navigationClient?: unknown): Promise<void>;
+}
diff --git a/webpack.config.js b/webpack.config.js
index 2b00b9f2b..3f1056546 100644
--- a/webpack.config.js
+++ b/webpack.config.js
@@ -116,6 +116,7 @@ module.exports = function (_env = {}, argv = {}) {
     galleryViewer: "./src/GalleryViewer/GalleryViewer.tsx",
     selfServe: "./src/SelfServe/SelfServe.tsx",
     connectToGitHub: "./src/GitHub/GitHubConnector.ts",
+    redirectBridge: "./src/redirectBridge.ts",
     ...(mode !== "production" && { testExplorer: "./test/testExplorer/TestExplorer.ts" }),
     ...(mode !== "production" && {
       searchableDropdownFixture: "./test/component-fixtures/searchableDropdown/SearchableDropdownFixture.tsx",
@@ -168,6 +169,11 @@ module.exports = function (_env = {}, argv = {}) {
       template: "src/SelfServe/selfServe.html",
       chunks: ["selfServe"],
     }),
+    new HtmlWebpackPlugin({
+      filename: "redirectBridge.html",
+      template: "src/redirectBridge.html",
+      chunks: ["redirectBridge"],
+    }),
     ...(mode !== "production"
       ? [
           new HtmlWebpackPlugin({