From 821cb72bb71ef9825afd8a007558da7f3cb91523 Mon Sep 17 00:00:00 2001
From: "dionisio-bot[bot]"
 <117394943+dionisio-bot[bot]@users.noreply.github.com>
Date: Tue, 18 Nov 2025 02:46:51 +0000
Subject: [PATCH] fix: improves how code access user-agent in the headers
 (#37540)

Co-authored-by: Lucas Pelegrino <16467257+lucas-a-pelegrino@users.noreply.github.com>
---
 .changeset/healthy-rabbits-sip.md                     | 5 +++++
 apps/meteor/ee/server/lib/deviceManagement/session.ts | 7 +++----
 2 files changed, 8 insertions(+), 4 deletions(-)
 create mode 100644 .changeset/healthy-rabbits-sip.md

diff --git a/.changeset/healthy-rabbits-sip.md b/.changeset/healthy-rabbits-sip.md
new file mode 100644
index 00000000000..5207f424628
--- /dev/null
+++ b/.changeset/healthy-rabbits-sip.md
@@ -0,0 +1,5 @@
+---
+"@rocket.chat/meteor": patch
+---
+
+Fixes an issue where `user-agent` is not properly extracted from the DDP connection headers
diff --git a/apps/meteor/ee/server/lib/deviceManagement/session.ts b/apps/meteor/ee/server/lib/deviceManagement/session.ts
index 23632257eaa..e985d7d60c4 100644
--- a/apps/meteor/ee/server/lib/deviceManagement/session.ts
+++ b/apps/meteor/ee/server/lib/deviceManagement/session.ts
@@ -3,7 +3,6 @@ import { Users } from '@rocket.chat/models';
 import { Accounts } from 'meteor/accounts-base';
 import { Meteor } from 'meteor/meteor';
 import moment from 'moment';
-import type { Headers } from 'node-fetch';
 import { UAParser } from 'ua-parser-js';
 
 import * as Mailer from '../../../../app/mailer/server/api';
@@ -67,9 +66,9 @@ export const listenSessionLogin = () => {
 			username,
 			emails: [{ address: email }],
 		} = user;
-		// TODO: Find why the httpheaders is being casted to IncomingHttpHeaders instead of Headers
-		const userAgentString = connection?.httpHeaders && (connection.httpHeaders as unknown as Headers).get('user-agent');
-		const { browser, os, device, cpu, app } = await uaParser(userAgentString || '');
+
+		const userAgentString = connection?.httpHeaders?.['user-agent'] ?? '';
+		const { browser, os, device, cpu, app } = await uaParser(userAgentString);
 
 		const mailData = {
 			name,