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.


      Zoho Campaigns Resources


        • Desk Community Learning Series


        • Digest


        • Functions


        • Meetups


        • Kbase


        • Resources


        • Glossary


        • Desk Marketplace


        • MVP Corner


        • Word of the Day


        • Ask the Experts


          • 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

          Zoho CRM Plus Resources

            Zoho Books Resources


              Zoho Subscriptions Resources

                Zoho Projects Resources


                  Zoho Sprints Resources


                    Zoho Orchestly Resources


                      Zoho Creator Resources


                        Zoho WorkDrive Resources



                          Zoho CRM Resources

                          • CRM Community Learning Series

                            CRM Community Learning Series


                          • Tips

                            Tips

                          • Functions

                            Functions

                          • Meetups

                            Meetups

                          • Kbase

                            Kbase

                          • Resources

                            Resources

                          • Digest

                            Digest

                          • CRM Marketplace

                            CRM Marketplace

                          • MVP Corner

                            MVP Corner




                            Zoho Writer Writer

                            Get Started. Write Away!

                            Writer is a powerful online word processor, designed for collaborative work.

                              Zoho CRM コンテンツ



                                ご検討中の方

                                  • Recent Topics

                                  • Converting Sales Order to Purchase Order

                                    Hi All, Firstly, this code works to convert a sales order(SO) to a purchase order (PO) via a button, however I am running into an issue when I convert the SO where the values from the line items are not pulled across from the SO to the PO. The ones in
                                  • CRM x WorkDrive: File storage for new CRM signups is now powered by WorkDrive

                                    Availability Editions: All DCs: All Release plan: Released for new signups in all DCs. It will be enabled for existing users in a phased manner in the upcoming months. Help documentation: Documents in Zoho CRM Manage folders in Documents tab Manage files
                                  • Ask the Experts 26: Brighten every customer interaction with Zoho Desk all year long

                                    Hello everyone, Greetings and welcome to Ask the Experts 26. As we wrap up 2025, we are excited to invite you to the 26th episode of our Ask the Expert series. 🎄The Merry Metrics Edition = Best of Zoho Desk [Best Practices + Holiday Automation + Year-End
                                  • HTML Tags added to Reports with Notes

                                    Recently Zoho added the ability to markup text within notes. That way, users can change font size, colors, etc. It's a great change. However, since the change, reports that include a column for "Note Content" are printing HTML tags within the report.
                                  • What is the difference between Zoho Campaigns and marketing hub?

                                    Zoho Campaigns is a permission-based email marketing tool for sending marketing emails and mass emails. Marketing Automation is a multichannel marketing automation tool that caters to organizations looking for tools to engage their users across multiple
                                  • All new Address Field in Zoho CRM: maintain structured and accurate address inputs

                                    The address field will be available exclusively for IN DC users. We'll keep you updated on the DC-specific rollout soon. It's currently available for all new sign-ups and for existing Zoho CRM orgs which are in the Professional edition. Latest update
                                  • Horrible Connectivity!

                                    I have used Meetings several times, but most of the time the connection is horrible. The video freezes, the audio freezes, and we end up cancelling the meeting. I am on a high speed internet connection, and Zoom works fine, so I know it's not a problem
                                  • Is it really true that I can't set the default 'deposit to' account in 2025?

                                    I've been using Books for 7 years and the default account has never been a problem. I usually manually reconcile invoices and have never had a thought about which account. It has always been my account. However, I recently noticed that for the past 4
                                  • Zoho DataPrep switching Date Format

                                    When using a pipeline that is importing Zoho Analytics data into Zoho DataPrep, the month and day of date fields are switched for some columns. For example, a Zoho Analytics record of "Nov. 8, 2025" will appear in Zoho DataPrep as "2025/08/11" in "yyyy/MM/dd"
                                  • Using Another Field Value for Workflow Field Update

                                    I'm trying to setup a Workflow with a "Field Update" action on the Lead module, but I would like the new value to actually be taken from a DIFFERENT Field's on the Lead record (vs just defining some static value..) Is this possible? Could I simply use
                                  • Auto-Invite Users to Portals in Zoho CRM based on Conditions

                                    Hello Everyone, You can now automate portal invitations in Zoho CRM with the new Auto-Invite users feature in Portal management. No more manually enabling portal access one by one. With this enhancement, you can automatically send invites for users to
                                  • Greek character in Deluxe script

                                    Hi, We have been using a script since 2022 which replaces characters in Greek contact names using replaceAll. Since this morning, all the Greek characters used in the script have turned to question marks. I tried retyping the characters, copy-pasting
                                  • Tax information

                                    Hello, I need help/guidance on how to add my organization's Tax/VAT information. Thank you Pavly
                                  • Build smarter Guided Conversations with Fork Blocks

                                    When your customers arrive on your support channel, they're not there to explore. They are usually confused and stuck while trying to fix something important. We understand how stressful that moment can feel and we want your bot to make things easier,
                                  • Custom item field won't allow decimal.

                                    Hello, I have a custom item field that needs to be able to have a value with a decimal place such as 6.7 or 6.18. I have tried custom formatting the input format but can not get the correct syntax to allow this. Is this possible in Zoho?
                                  • Free webinar: Zoho Sign unwrapped – 2025 in review

                                    Hey there! 2025 is coming to an end, and this year has been all about AI. Join our exclusive year-end webinar, where we'll walk you through the features that went live in 2025, provide answers to your questions, and give you a sneak peek on what to expect
                                  • Customer ticket creation via Microsoft Teams

                                    Hi all, I'm looking to see if someone could point me in the right direction. I'd love to make it so my customers/ end users can make tickets, see responses and respond within microsoft teams. As Admin and an Agent i've installed the zoho assist app within
                                  • HubSpot CRM to Zoho Creator Integration

                                    I'm trying to create an integration between HubSpot CRM and Zoho Creator with HubSpot being the push source (if a contact is created or updated in HubSpot, it pushes the information to Zoho Creator). I have two questions: 1- Is it best to use Zoho Flow
                                  • Zoho Sign - Zoho CRM extension upgrade

                                    Hi everyone, We've updated Zoho Sign extension for Zoho CRM with significant internal changes. Impact on existing Zoho Sign extension users Users using the extension without customization If you are using the integration without implementing Zoho Sign's
                                  • Custom Fields

                                    There is no way to add a custom field in the "Timesheet" module. Honestly, the ability to add a custom field should be available in every module.
                                  • Contact data removes Account data when creating a quote

                                    Hi, Our customer has address fields in their quote layout which should be the address of the Account. They prefill the information, adding the account name - the address data is populated as per what is in the account - great. However when they then add
                                  • Gain control over record sharing with portal users through our new enhancement: criteria-based data exposure

                                    Dear Customers, We hope you're well! Portals is a self-service avenue through which your clients can access and manage their direct and related data in Zoho CRM. This empowers them to be more independent and enables them to experience a sense of transparency
                                  • Best-practice setup in Zoho One for managing combined candidate pools and exporting anonymised CVs

                                    We are new users of the Zoho One bundle and operate a consulting and engineering company. Our workforce model includes a mix of permanent employees, active job applicants, and freelance/independent consultants. All three groups need to be searchable,
                                  • Meet Canvas' Grid component: Your easiest way to build responsive record templates

                                    Visual design can be exciting—until you're knee-deep in the details. Whether it's aligning text boxes to prevent overlaps, fixing negative space, or simply making sure the right data stands out, just ironing out inconsistencies takes a lot of moving parts.
                                  • hard-bounced email list

                                    Hi, Below pops up when I try to send an Email to some of my customer. Please guide me how to take it out from hard-bounced list? I am not sure how they were marked in hard-bounced list
                                  • Register the 'Contact Role' addition and change as a Potential edition so it can trigger Workflows

                                    We are trying to use "Contact Roles" in Potentials. Contact Roles are special and different than the other Related lists, so, it may have a special behavior. Something to keep in mind is that you will never have 100 Contact Roles as you can have 100 Tasks, Calls, or any other Related list. In our case we will have 2 in average and up to 4 or 5 maximum. The problem is that we need to bring information from 3 key Contact Roles to the Potential and adding a Contact to the Contacts Roles area never trigger
                                  • Can I change the format of the buttons in the email templates?

                                    Hi all! We have been working hard trying to brand our email templates, and have some way to go yet. One of the things we can't seem to edit is the green ${Cases.CUSTOMER_PORTAL_BUTTON} button and the font of the View Ticket text. Is there any way of doing
                                  • Best practice to structure reporting to include events covering multiple months / quarters.

                                    Hi, I'm new to Zoho, have some experience of more "enterprise" tools, looking for some input from the community. I'm looking to create a report that includes events that cover a long period, each event has a start / end date and I'm struggling undertanding
                                  • Marketing Tip #11: Turn features into benefits that sell

                                    We all love talking about our products, but here’s a secret: customers don’t just buy features, they buy benefits. Instead of just saying "Made from 100% organic cotton," try "Soft, breathable comfort that lasts all day." Benefits tell shoppers how your
                                  • Zoho Sheet - Printing - Page Breaks and Printing Customization

                                    I think the title is descriptive enough in that I cannot find help documentation on a simple task of adding in page brakes for separating pages on print. Thanks
                                  • Synchronise item image between Zoho Commerce and Zoho Books/Inventory/CRM

                                    Here is a blindingly simple idea to tie several Zoho products together. Zoho - please include a method to synchronise the item image (or images) from one Zoho application to another. For example, if you upload an item image in Zoho Inventory, a user should
                                  • How do I migrate from zoho mail to Office 365?

                                    The manual migration of Zoho Mail to Microsoft 365 typically requires using IMAP to move emails and configuring Microsoft Outlook to sync Zoho Mail. This approach can be error-prone, especially if there are multiple accounts or large email archives. Moreover,
                                  • Exciting Updates to the Kiosk Studio Feature in Zoho CRM!

                                    Hello Everyone, We are here again with a series of new enhancements to Kiosk Studio, designed to elevate your experience and bring even greater efficiency to your business processes. These updates build upon our ongoing commitment to making Kiosk a powerful
                                  • New Update: Convert External Users in Bulk in Zoho Directory

                                    Greetings to all Zoho Directory users out there! We’re excited to introduce a new update that makes user management in Zoho Directory even more efficient; you can now convert external users in bulk! Earlier, admins could convert only one external user
                                  • New Update: Convert External Users in Bulk in Zoho One

                                    Greetings to all Zoho One users out there! We’re excited to introduce a new update that makes user management in Zoho One even more efficient; you can now convert external users in bulk! Earlier, admins could convert only one external user at a time.
                                  • How to edit form layout for extension

                                    I am working on extension development. I have created all the fields. I want to rearrange the layout in Sigma platform. But there is no layout module in Sigma. How can I achieve this for extensions other than Zet CLI and putting the fields into widget
                                  • Website not properly connecting with Zoho Creator app portal (embed & data sync issue)

                                    Hello Zoho Community, I’m currently facing an issue while trying to connect my external website with a Zoho Creator app portal. I have a tool-based website ( https://mygardencalculator.com/ ) where users interact with calculators and dynamic content.
                                  • 日本語フォントの選択肢拡充についての要望

                                    日本語フォントの選択肢がとても少ないと感じたことはありませんか? 多くのアプリ(たとえば Invoice)ではフォントが1種類しかなく、正直あまり使いやすい・見た目が良いとも言えません。 そろそろ、もっと多くの日本語フォントを追加してほしい、そしてすべてのアプリで同じフォント選択肢を使えるようにしてほしいと、私たちユーザーが声を上げる時期だと思います。 ご存じのとおり、現状ではアプリごとにフォント周りの仕様にほとんど一貫性がありません。 みなさん、一緒に要望を出していきましょう!
                                  • Does anyone know how to setup Zoho Desk or Zoho CRM as a custom outgoing/incoming Call Centre?

                                    I need to setup a call center so I can setup agents to make phone calls across Canada to market our services.  I am trying to figure out the most reliable and cost efficient way to do this? I am currently paying for two phone services and neither seem
                                  • Display actual mileage on an invoice

                                    My users are creating expenses in Zoho expense. For example, they expense 10 miles and get paid 7 dollars (10 miles * IRS rate of .70). If I look at the expenses in Zoho Books, it does show them at 10 miles at .70 cent When I add these expense to an invoice
                                  • Next Page