diff --git a/CHANGELOG.md b/CHANGELOG.md
index e69de29bb2d..b8678174f69 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -0,0 +1 @@
+- Fixes `auth:export` and `auth:import` dropping `mfaInfo` data for users with Multi-Factor Authentication enabled.
diff --git a/firebase-vscode/src/utils/settings.ts b/firebase-vscode/src/utils/settings.ts
index 216a2d085c4..af0c5c711eb 100644
--- a/firebase-vscode/src/utils/settings.ts
+++ b/firebase-vscode/src/utils/settings.ts
@@ -33,7 +33,7 @@ export function getSettings(): Settings {
     firebaseBinaryKind = "firepit-global";
   }
 
-  const extraEnv = config.get<Record<string,string>>("extraEnv", {})
+  const extraEnv = config.get<Record<string,string>>("extraEnv", {});
   process.env = { ...process.env, ...extraEnv };
   
   return {
diff --git a/src/accountExporter.spec.ts b/src/accountExporter.spec.ts
index 4d25b00b92e..ed3518974d8 100644
--- a/src/accountExporter.spec.ts
+++ b/src/accountExporter.spec.ts
@@ -9,20 +9,24 @@ import { validateOptions, serialExportUsers } from "./accountExporter";
 describe("accountExporter", () => {
   describe("validateOptions", () => {
     it("should reject when no format provided", () => {
-      expect(() => validateOptions({}, "output_file")).to.throw();
+      expect(() => {
+        validateOptions({}, "output_file");
+      }).to.throw();
     });
 
     it("should reject when format is not csv or json", () => {
-      expect(() => validateOptions({ format: "txt" }, "output_file")).to.throw();
+      expect(() => {
+        validateOptions({ format: "txt" }, "output_file");
+      }).to.throw();
     });
 
     it("should ignore format param when implicitly specified in file name", () => {
-      const ret = validateOptions({ format: "JSON" }, "output_file.csv");
+      const ret = validateOptions({ format: "JSON" }, "output_file.csv") as { format: string };
       expect(ret.format).to.eq("csv");
     });
 
     it("should use format param when not implicitly specified in file name", () => {
-      const ret = validateOptions({ format: "JSON" }, "output_file");
+      const ret = validateOptions({ format: "JSON" }, "output_file") as { format: string };
       expect(ret.format).to.eq("json");
     });
   });
@@ -35,6 +39,7 @@ describe("accountExporter", () => {
       displayName: string;
       disabled: boolean;
       customAttributes?: string;
+      mfaInfo?: unknown[];
       providerUserInfo?: {
         providerId: string;
         rawId: string;
@@ -56,8 +61,8 @@ describe("accountExporter", () => {
         if (i === 6) {
           userList.push({
             localId: i.toString(),
-            email: "test" + i + "@test.org",
-            displayName: "John Tester" + i,
+            email: `test${i}@test.org`,
+            displayName: `John Tester${i}`,
             disabled: i % 2 === 0,
             providerUserInfo: [
               {
@@ -71,8 +76,8 @@ describe("accountExporter", () => {
         } else {
           userList.push({
             localId: i.toString(),
-            email: "test" + i + "@test.org",
-            displayName: "John Tester" + i,
+            email: `test${i}@test.org`,
+            displayName: `John Tester${i}`,
             disabled: i % 2 === 0,
           });
         }
@@ -311,6 +316,38 @@ describe("accountExporter", () => {
       expect(nock.isDone()).to.be.true;
     });
 
+    it("should export a user's mfaInfo for JSON formats", async () => {
+      userList[0].mfaInfo = [
+        {
+          mfaEnrollmentId: "enrollment-id-1",
+          displayName: "My SMS MFA",
+          phoneInfo: "+11111111111",
+          enrolledAt: "2026-06-24T00:00:00Z",
+        },
+      ];
+      nock("https://www.googleapis.com")
+        .post("/identitytoolkit/v3/relyingparty/downloadAccount", {
+          maxResults: 3,
+          targetProjectId: "test-project-id",
+        })
+        .reply(200, {
+          users: userList.slice(0, 3),
+        });
+      await serialExportUsers("test-project-id", {
+        format: "JSON",
+        batchSize: 3,
+        writeStream: writeStream,
+      });
+      expect(spyWrite.getCall(0).args[0]).to.eq(JSON.stringify(userList[0], null, 2));
+      expect(spyWrite.getCall(1).args[0]).to.eq(
+        "," + os.EOL + JSON.stringify(userList[1], null, 2),
+      );
+      expect(spyWrite.getCall(2).args[0]).to.eq(
+        "," + os.EOL + JSON.stringify(userList[2], null, 2),
+      );
+      expect(nock.isDone()).to.be.true;
+    });
+
     function mockAllUsersRequests(): void {
       nock("https://www.googleapis.com")
         .post("/identitytoolkit/v3/relyingparty/downloadAccount", {
diff --git a/src/accountExporter.ts b/src/accountExporter.ts
index 91965bf778d..22c07a7e307 100644
--- a/src/accountExporter.ts
+++ b/src/accountExporter.ts
@@ -11,7 +11,6 @@ const apiClient = new Client({
   urlPrefix: googleOrigin(),
 });
 
-// TODO: support for MFA at runtime was added in PR #3173, but this exporter currently ignores `mfaInfo` and loses the data on export.
 const EXPORTED_JSON_KEYS = [
   "localId",
   "email",
@@ -25,6 +24,7 @@ const EXPORTED_JSON_KEYS = [
   "phoneNumber",
   "disabled",
   "customAttributes",
+  "mfaInfo",
 ];
 const EXPORTED_JSON_KEYS_RENAMING: Record<string, string> = {
   lastLoginAt: "lastSignedInAt",
diff --git a/src/accountImporter.spec.ts b/src/accountImporter.spec.ts
index 2965278499e..fa20befc181 100644
--- a/src/accountImporter.spec.ts
+++ b/src/accountImporter.spec.ts
@@ -148,6 +148,23 @@ describe("accountImporter", () => {
         }),
       ).to.not.have.property("error");
     });
+
+    it("should not reject when mfaInfo is present in user json", () => {
+      expect(
+        validateUserJson({
+          localId: "123",
+          email: "test@test.org",
+          mfaInfo: [
+            {
+              mfaEnrollmentId: "enrollment-id-1",
+              displayName: "My SMS MFA",
+              phoneInfo: "+11111111111",
+              enrolledAt: "2026-06-24T00:00:00Z",
+            },
+          ],
+        }),
+      ).to.not.have.property("error");
+    });
   });
 
   describe("serialImportUsers", () => {
diff --git a/src/accountImporter.ts b/src/accountImporter.ts
index 39a9e741387..16515e3427b 100644
--- a/src/accountImporter.ts
+++ b/src/accountImporter.ts
@@ -10,7 +10,6 @@ const apiClient = new Client({
   urlPrefix: googleOrigin(),
 });
 
-// TODO: support for MFA at runtime was added in PR #3173, but this importer currently ignores `mfaInfo` and loses the data on import.
 const ALLOWED_JSON_KEYS = [
   "localId",
   "email",
@@ -25,6 +24,7 @@ const ALLOWED_JSON_KEYS = [
   "phoneNumber",
   "disabled",
   "customAttributes",
+  "mfaInfo",
 ];
 const ALLOWED_JSON_KEYS_RENAMING = {
   lastSignedInAt: "lastLoginAt",