From 5464b1c9bd09c4848d8835954e4596604fb62205 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 4 Nov 2025 23:05:11 +0000
Subject: [PATCH 1/3] Initial plan


From 410206ab1d418b1748ebfd904526f9240bfdc1ac Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Tue, 4 Nov 2025 23:16:13 +0000
Subject: [PATCH 2/3] Add allow="local-network-access *" attribute to iframe
 for Chrome 142 compatibility

Co-authored-by: tnorling <5307810+tnorling@users.noreply.github.com>
---
 .../src/interaction_handler/SilentHandler.ts        |  1 +
 .../test/interaction_handler/SilentHandler.spec.ts  | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/lib/msal-browser/src/interaction_handler/SilentHandler.ts b/lib/msal-browser/src/interaction_handler/SilentHandler.ts
index e896e65b22..82917963e5 100644
--- a/lib/msal-browser/src/interaction_handler/SilentHandler.ts
+++ b/lib/msal-browser/src/interaction_handler/SilentHandler.ts
@@ -256,6 +256,7 @@ function createHiddenIframe(): HTMLIFrameElement {
         "sandbox",
         "allow-scripts allow-same-origin allow-forms"
     );
+    authFrame.setAttribute("allow", "local-network-access *");
     document.body.appendChild(authFrame);
 
     return authFrame;
diff --git a/lib/msal-browser/test/interaction_handler/SilentHandler.spec.ts b/lib/msal-browser/test/interaction_handler/SilentHandler.spec.ts
index 6629120c5b..ff0d458d85 100644
--- a/lib/msal-browser/test/interaction_handler/SilentHandler.spec.ts
+++ b/lib/msal-browser/test/interaction_handler/SilentHandler.spec.ts
@@ -98,6 +98,19 @@ describe("SilentHandler.ts Unit Tests", () => {
             expect(endTime - startTime).toBeLessThan(DEFAULT_IFRAME_TIMEOUT_MS);
             expect(authFrame instanceof HTMLIFrameElement).toBe(true);
         });
+
+        it("Sets the allow attribute for local network access on iframe", async () => {
+            const authFrame = await SilentHandler.initiateCodeRequest(
+                testNavUrl,
+                performanceClient,
+                browserRequestLogger,
+                RANDOM_TEST_GUID,
+                0
+            );
+            expect(authFrame.getAttribute("allow")).toBe(
+                "local-network-access *"
+            );
+        });
     });
 
     describe("monitorIframeForHash", () => {

From 52078e2fa8934359fc74ebea38f9f3fc4858b37d Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 5 Nov 2025 00:17:32 +0000
Subject: [PATCH 3/3] Change files

---
 ...-msal-browser-bc911259-ba35-43da-8c09-76cc3916692c.json | 7 +++++++
 1 file changed, 7 insertions(+)
 create mode 100644 change/@azure-msal-browser-bc911259-ba35-43da-8c09-76cc3916692c.json

diff --git a/change/@azure-msal-browser-bc911259-ba35-43da-8c09-76cc3916692c.json b/change/@azure-msal-browser-bc911259-ba35-43da-8c09-76cc3916692c.json
new file mode 100644
index 0000000000..a4e31eddca
--- /dev/null
+++ b/change/@azure-msal-browser-bc911259-ba35-43da-8c09-76cc3916692c.json
@@ -0,0 +1,7 @@
+{
+  "type": "patch",
+  "comment": "Add allow=\"local-network-access *\" attribute to iframe for Chrome 142 compatibility",
+  "packageName": "@azure/msal-browser",
+  "email": "198982749+Copilot@users.noreply.github.com",
+  "dependentChangeType": "patch"
+}