Deprecation of SMS-based multi-factor authentication (MFA) mode

Deprecation of SMS-based multi-factor authentication (MFA) mode

Overview of SMS-based OTP MFA mode 

The SMS-based OTP MFA method involves the delivery of a one-time password to a user's mobile phone via SMS. The user receives the OTP on their mobile phone and enters it to sign into their account.

SMS-based OTPs offer convenience due to their accessibility; nearly everyone possesses a mobile phone and SMS-based OTPs arrive quickly, allowing for easy and secure authentication.

However, there are some other considerations and security risks that make the SMS-based OTP one of the least preferable options for multi-factor authentication. Hence, we’ve decided to deprecate it as an MFA mode.

Reasons for deprecation 

SMS-based OTPs are susceptible to various attacks, including phishing, SIM swapping, and signaling system 7.

Phishing attack: Scammers send fake messages with links to websites that resemble our sign-in page. For example:
They trick you into entering your login details and OTPs. If you do, scammers can access your account, putting your personal information and security at risk.

SIM swapping: By knowing your phone number, a scammer can contact your telecom provider's customer service and request to transfer your phone number to a new SIM card, giving them access to your accounts and personal data without your consent.

Signaling system 7 attack: A hacker can spy on you via the cell phone signaling system, where they can listen to calls, intercept text messages, and track your phone's location, leading to serious security risks.

Considering the security threats in SMS-based OTPs and the guidelines on implementing phishing-resistant MFA given by the Cybersecurity & Infrastructure Security Agency (CISA) of the United States government, we deprecated the SMS-based OTP MFA mode.

➤ Current status
     Deprecation of SMS-based OTP MFA mode for all users who signed up after January 1, 2024.

➤ Upcoming plan
     Migration of existing users and organizations currently enforcing SMS-based OTP MFA to alternate MFA modes.  

Alternate MFA modes

If you’re an organization admin, you can set up a different MFA mode for your organization in the security policies. If you’re a personal user, you can go to the multi-factor authentication section at accounts.zoho.com and set up any of the MFA modes described below.
  • OneAuth (recommended)
    Zoho OneAuth is a multi-factor authentication app that you can use to secure your Zoho account as well as third-party accounts, including Google, Facebook, and Microsoft. With OneAuth, you can set up any of the three authentication modes: push notifications, time-based OTPs, and QR codes.

  • OTP authenticator
    OTP authenticators are apps you can use to set up MFA for your account. These apps generate new OTPs in duration you set, which you can use to sign in to your account.
    Learn how to set up an OTP authenticator.

  • Security key
    A security key is a hardware device that you link to your account to enable multi-factor authentication. Once linked, you'll need to use this key each time you sign in to verify your identity.
    Learn how to set up the security key.
If you have any questions, please write to us at support@zohoaccounts.com.

    • Sticky Posts

    • Deprecation of SMS-based multi-factor authentication (MFA) mode

      Overview of SMS-based OTP MFA mode The SMS-based OTP MFA method involves the delivery of a one-time password to a user's mobile phone via SMS. The user receives the OTP on their mobile phone and enters it to sign into their account. SMS-based OTPs offer
    • Recent Topics

    • {"errors":[{"id":"500","title":"Servlet execution threw an exception"}]}

      Here's the call to move a file to trash. The resource_id is accurate and the file is present. header = Map(); header.put("Accept","application/vnd.api+json"); data = Map(); data_param1 = Map(); att_param1 = Map(); att_param1.put("status",51); data_param1.put("attributes",att_param1);
    • Converting Sales Order to Invoice via API; Problem with decimal places tax

      We are having problems converting a Sales Order to an Invoice via API Call. The cause of the issue is, that the Tax value in a Sales Order is sometimes calculated with up to 16 decimal places (e.g. 0.8730000000000001). The max decimal places allowed in
    • Zoho Canvas - Custom templates for related lists

      Hi, I see that the example pages load always one of our related lists in a custom template, but I dont know how to work with that:  1) How can i make my own custom templates for related lists?  2) Where and how can i check out existing custom templates?
    • Kaizen #147 - Frequently Asked Questions on Zoho CRM Widgets

      Heya! It's Kaizen time again, folks! This week, we aim to address common queries about Zoho CRM Widgets through frequently asked questions from our developer forum. Take a quick glance at these FAQs and learn from your peers' inquiries. 1. Where can I
    • open word file in zoho writer desktop version

      "How can I open a Microsoft Word (.doc or .docx) file in Zoho Writer if I only have the file saved on my computer and Zoho Writer doesn't appear as an option when I try 'Open with'? Is there a way to directly open the .doc file in Zoho Writer?"
    • Zoho PDF editor has a lot of issues.

      Zoho PDF editor needs a lot of work. It hangs and glitches a lot. Deletes annotations and clearings randomly.
    • Zohom mail

      Plz resolve the problem . I hope u understand .
    • Zoho sheet desktop version

      Hi Zoho team Where can I access desktop version of zoho sheets? It is important as web version is slow and requires one to be online all the time to do even basic work. If it is available, please guide me to the same.
    • ZOHO SHEETS

      Where can I access desktop version of zoho sheets? It is important to do basic work If it is available, please guide me to the same
    • Using Zoho Flow to create sales orders from won deal in Zoho CRM

      Hi there, We are using Zoho Flow to create sales orders automatically when a deal is won in Zoho CRM. However, the sales order requires "Product Details" to be passed in "jsonobject", and is resulting in this error: Zoho CRM says "Invalid input for invalid
    • Is Zoho Sheet available for Linux ?

      Is Zoho Sheet available for Linux ?
    • Zoho pdf suit

      Pl. design products with following feature: 1. Please add all features given in Ilovepdf website to work on pdf files. It is mandatory to use pdf in court work. 2. Courts have prescribed New Times Roman, pl. add this font as well 3. Indexing, signature
    • Bharat

      a
    • how to disable staff selection Zoho Booking integrated to SalesIQ?

      currently there is only one Consultant in my Zoho Bookings like this I integrate Zoho Bookings into Zoho SalesIQ to create a chatbot. Unfortunately, even though I only have one consultant for a consultation, the user have to pick the consultant. It will
    • Zoho Bookings No Sync with Outlook

      Zoho Bookings appointments are showing on my Outlook Calendar but Outlook events are not showing on Zoho Bookings. How do I fix this?
    • End Date in Zoho Bookings

      When I give my appointments a 30 minutes time I would expect the software not to even show the End Time.  But it actually makes the user pick an End Time.  Did I just miss a setting?  
    • Custom confirmation message

      How can I change the message that users see after they submit the booking form? I have to confirm some details before their appointment is officially "confirmed", so I want to change it where it doesn't say their appointment is "confirmed" but rather
    • Issue showing too many consultations in my workspace link.

      Hi Team, I’ve set up two Workspaces to track meetings from different sources. So far, this has been working well, and the two Workspaces are differentiated without any issues. However, when I navigate to Consultations and share the link to my personal
    • Deluge sendmail in Zoho Desk schedule can't send email from a verified email address

      I am trying to add a scheduled action with ZDesk using a Deluge function that sends a weekly email to specific ticket client contacts I've already verified the email address for use in ZDesk, but sendmail won't allow it in its "from:" clause. I've attached
    • Addin Support in Zoho Sheet

      Is there any addin support available in zoho sheet as like google marketplace to enhance productivity by connecting with other apps, providing AI data analysis, streamlining business processes, and more?
    • Changing Corporate Structure - How Best to Adapt Current and Future Zoho Instances

      My current company is Company A LLC with a dba ("doing business as" - essentially an alias) Product Name B. Basically, Company A is the legal entity and Product Name B is what customers see, but it's all one business right now. We currently have a Zoho
    • How to Install Zoho Workdrive Desktop Sync for Ubuntu?

      Hi. I am newbie to Linux / Ubuntu. I downloaded a tar.gz file from Workdrive for installing the Workdrive Desktop Sync tool. Can someone give me step by step guide on how to install this on Ubuntu? I am using Ubuntu 19.04. Regards Senthil
    • How to upload own video?

      How can you upload your own video on your zoho website? I do not want to use another host, but i want to insert my own files. how can i do this?
    • Support new line in CRM Multiline text field display in Zoho Deluge

      Hi brainstrust, We have a Zoho CRM field which is a Muti Line (Small) field. It has data in it that has a carriage return after each line: When I pull that data in via Deluge, it displays as: I'm hoping a way I can change it from: Freehand : ENABLED Chenille
    • Announcing new features in Trident for Windows (v.1.32.5.0)

      Hello Community! Trident for Windows just got better! This update includes new features designed to improve and simplify email and calendar management—and it includes a feature you’ve been waiting for. Let’s dive into what’s new! Save emails in EML or
    • How to render either thumbnail_url or preview_url or preview_data_url

      I get 401 Unauthorised when using these urls in the <img> tag src attribute. Guide me on how to use them!
    • Zoho CRM Calendar | Custom Buttons

      I'm working with my sales team to make our scheduling process easier for our team. We primary rely on Zoho CRM calendar to organize our events for our sales team. I was wondering if there is a way to add custom button in the Calendar view on events/meeting
    • Create Lead Button in Zoho CRM Dashboard

      Right now to create Leads in the CRM our team is going into the Lead module, selecting the "Create Lead" button, then building out the lead. Is there anyway to add the "Create Lead" button or some sort of short cut to the Zoho CRM Dashboard to cut out
    • Searching customer field

      Hello, When entering a receipt, we select customer information. The customer information is synced with Zoho CRM. However, we can't find the customer information because it searches for words that begin with the entered value. It needs to search for words
    • Introducing Version-3 APIs - Explore New APIs & Enhancements

      Happy to announce the release of Version 3 (V3) APIs with an easy to use interface, new APIs, and more examples to help you understand and access the APIs better. V3 APIs can be accessed through our new link, where you can explore our complete documentation,
    • Zoho CRM Tracking Google Enhanced Conversions

      Can anyone @Zoho, consultants, or users help me understand if Zoho CRM is going to support Google's Enhanced Conversions? I included some information from Google below about it. We use Google Adwords for our pay per click advertising for lead generation,
    • zoho click, and nord VPN

      Unfortunately, we've been having problems with Zoho Click, where essentially the line cuts off after about a minute's worth of conversation every time we are on VPN. Is there a way we can change this within the settings so it does not cut the line off
    • Connecting Portals from different Zoho apps

      Hi, I note that Zoho has functionality for customer portals for several of the Zoho apps, like CRM, Projects, Desk etc. Is there any way to connect these portals?  It would be great if we could give our customers access to a portal in which they could
    • Billing Management: #5 Usage Billing

      After understanding the nuances of Advance Billing and Retainers, we will explore one of the booming billing models. Long ago, villagers drew water from a shared well in a small village. The well was a lifeline for the entire community. Ravi, the well
    • Function #10: Update item prices automatically based on the last transaction created

      In businesses, item prices are not always fixed and can fluctuate due to various factors. If you find yourself manually adjusting the item rates every time they change, we have the ideal time-saving solution for you. In today's post, we bring you custom
    • Inventory Adjustments

      Hi, How to transfer the material from one head to another ? Like materials purchased for manufacturing the laptop need to transfer from consumption inventory (Quantity of raw materials reduced) to destination inventory ( Quantity of Laptop increased)
    • Zoho CRM Community Digest - Aug 2025 | Part 1

      Hey everyone! The first half of August went by, and we have a few announcements and some good noteworthy discussions. So, let's take a look at them! Product Updates: Introducing Connected Records feature: Zoho CRM’s Next-Gen UI now includes Connected
    • Please make it easier to Pause syncing

      right now it takes 3 clicks to get there. sounds silly, but can you make it just 2 clicks to get it done instead? thats how dropbox does it, 2 clicks to pause instead of 3.
    • How to create a Zoho CRM report with 2 child modules

      Hi all, Is it possible to create a Zoho CRM report or chart with 2 child modules? After I add the first child module, the + button only adds another parent module. It won't let me add multiple child modules at once. We don't have Zoho Analytics and would
    • SalesIQとPageSenseの利用について

      初めての投稿で場違いだったらすいません。 弊社ではSalesIQを運用しているのですが、追加でPageSenseの導入もしたいと現場からの声があります。 両サービスともクッキー同意バナーが必要なサービスなのですが 弊社では同意無しに情報はとりませんという方針なので 2つ入れると2つバナーを出す必要がでてきます・・・ 両サービスを運用されてる方があれば運用状況とか教えてほしいです。 PageSenseについては詳細まで機能を理解してないなかでの質問です。
    • Next Page