diff --git a/backend/src/db/migrations/20240522072006_add-user-account-mfa-locking.ts b/backend/src/db/migrations/20240522072006_add-user-account-mfa-locking.ts
new file mode 100644
index 000000000..2b2ecd783
--- /dev/null
+++ b/backend/src/db/migrations/20240522072006_add-user-account-mfa-locking.ts
@@ -0,0 +1,43 @@
+import { Knex } from "knex";
+
+import { TableName } from "../schemas";
+
+export async function up(knex: Knex): Promise<void> {
+  const hasConsecutiveFailedMfaAttempts = await knex.schema.hasColumn(TableName.Users, "consecutiveFailedMfaAttempts");
+  const hasIsLocked = await knex.schema.hasColumn(TableName.Users, "isLocked");
+  const hasTemporaryLockDateEnd = await knex.schema.hasColumn(TableName.Users, "temporaryLockDateEnd");
+
+  await knex.schema.alterTable(TableName.Users, (t) => {
+    if (!hasConsecutiveFailedMfaAttempts) {
+      t.integer("consecutiveFailedMfaAttempts").defaultTo(0);
+    }
+
+    if (!hasIsLocked) {
+      t.boolean("isLocked").defaultTo(false);
+    }
+
+    if (!hasTemporaryLockDateEnd) {
+      t.dateTime("temporaryLockDateEnd").nullable();
+    }
+  });
+}
+
+export async function down(knex: Knex): Promise<void> {
+  const hasConsecutiveFailedMfaAttempts = await knex.schema.hasColumn(TableName.Users, "consecutiveFailedMfaAttempts");
+  const hasIsLocked = await knex.schema.hasColumn(TableName.Users, "isLocked");
+  const hasTemporaryLockDateEnd = await knex.schema.hasColumn(TableName.Users, "temporaryLockDateEnd");
+
+  await knex.schema.alterTable(TableName.Users, (t) => {
+    if (hasConsecutiveFailedMfaAttempts) {
+      t.dropColumn("consecutiveFailedMfaAttempts");
+    }
+
+    if (hasIsLocked) {
+      t.dropColumn("isLocked");
+    }
+
+    if (hasTemporaryLockDateEnd) {
+      t.dropColumn("temporaryLockDateEnd");
+    }
+  });
+}
diff --git a/backend/src/db/schemas/users.ts b/backend/src/db/schemas/users.ts
index d5a4d5b49..935351d33 100644
--- a/backend/src/db/schemas/users.ts
+++ b/backend/src/db/schemas/users.ts
@@ -22,9 +22,15 @@ export const UsersSchema = z.object({
   updatedAt: z.date(),
   isGhost: z.boolean().default(false),
   username: z.string(),
-  isEmailVerified: z.boolean().default(false).nullable().optional()
+  isEmailVerified: z.boolean().default(false).nullable().optional(),
+  consecutiveFailedMfaAttempts: z.number(),
+  isLocked: z.boolean(),
+  temporaryLockDateEnd: z.date().nullable().optional()
 });
 
 export type TUsers = z.infer<typeof UsersSchema>;
-export type TUsersInsert = Omit<z.input<typeof UsersSchema>, TImmutableDBKeys>;
+export type TUsersInsert = Omit<
+  z.input<typeof UsersSchema>,
+  TImmutableDBKeys | "isLocked" | "consecutiveFailedMfaAttempts"
+>;
 export type TUsersUpdate = Partial<Omit<z.input<typeof UsersSchema>, TImmutableDBKeys>>;
diff --git a/backend/src/server/routes/v1/user-router.ts b/backend/src/server/routes/v1/user-router.ts
index bdede8a3a..aa3962c5a 100644
--- a/backend/src/server/routes/v1/user-router.ts
+++ b/backend/src/server/routes/v1/user-router.ts
@@ -1,11 +1,15 @@
 import { z } from "zod";
 
 import { UserEncryptionKeysSchema, UsersSchema } from "@app/db/schemas";
-import { readLimit } from "@app/server/config/rateLimiter";
+import { getConfig } from "@app/lib/config/env";
+import { logger } from "@app/lib/logger";
+import { authRateLimit, readLimit } from "@app/server/config/rateLimiter";
 import { verifyAuth } from "@app/server/plugins/auth/verify-auth";
 import { AuthMode } from "@app/services/auth/auth-type";
 
 export const registerUserRouter = async (server: FastifyZodProvider) => {
+  const appCfg = getConfig();
+
   server.route({
     method: "GET",
     url: "/",
@@ -25,4 +29,28 @@ export const registerUserRouter = async (server: FastifyZodProvider) => {
       return { user };
     }
   });
+
+  server.route({
+    method: "GET",
+    url: "/:userId/unlock-verify",
+    config: {
+      rateLimit: authRateLimit
+    },
+    schema: {
+      querystring: z.object({
+        token: z.string().trim()
+      }),
+      params: z.object({
+        userId: z.string()
+      })
+    },
+    handler: async (req, res) => {
+      try {
+        await server.services.user.unlockUser(req.params.userId, req.query.token);
+      } catch (err) {
+        logger.error(`User unlock failed for ${req.params.userId}`);
+      }
+      return res.redirect(`${appCfg.SITE_URL}/login`);
+    }
+  });
 };
diff --git a/backend/src/services/auth-token/auth-token-service.ts b/backend/src/services/auth-token/auth-token-service.ts
index 5d68a4e94..b1f8aa2f6 100644
--- a/backend/src/services/auth-token/auth-token-service.ts
+++ b/backend/src/services/auth-token/auth-token-service.ts
@@ -13,8 +13,9 @@ import { TCreateTokenForUserDTO, TIssueAuthTokenDTO, TokenType, TValidateTokenFo
 
 type TAuthTokenServiceFactoryDep = {
   tokenDAL: TTokenDALFactory;
-  userDAL: Pick<TUserDALFactory, "findById">;
+  userDAL: Pick<TUserDALFactory, "findById" | "transaction">;
 };
+
 export type TAuthTokenServiceFactory = ReturnType<typeof tokenServiceFactory>;
 
 export const getTokenConfig = (tokenType: TokenType) => {
@@ -53,6 +54,11 @@ export const getTokenConfig = (tokenType: TokenType) => {
       const expiresAt = new Date(new Date().getTime() + 86400000);
       return { token, expiresAt };
     }
+    case TokenType.TOKEN_USER_UNLOCK: {
+      const token = crypto.randomBytes(16).toString("hex");
+      const expiresAt = new Date(new Date().getTime() + 259200000);
+      return { token, expiresAt };
+    }
     default: {
       const token = crypto.randomBytes(16).toString("hex");
       const expiresAt = new Date();
diff --git a/backend/src/services/auth-token/auth-token-types.ts b/backend/src/services/auth-token/auth-token-types.ts
index 630e36310..8917bd672 100644
--- a/backend/src/services/auth-token/auth-token-types.ts
+++ b/backend/src/services/auth-token/auth-token-types.ts
@@ -3,7 +3,8 @@ export enum TokenType {
   TOKEN_EMAIL_VERIFICATION = "emailVerification", // unverified -> verified
   TOKEN_EMAIL_MFA = "emailMfa",
   TOKEN_EMAIL_ORG_INVITATION = "organizationInvitation",
-  TOKEN_EMAIL_PASSWORD_RESET = "passwordReset"
+  TOKEN_EMAIL_PASSWORD_RESET = "passwordReset",
+  TOKEN_USER_UNLOCK = "userUnlock"
 }
 
 export type TCreateTokenForUserDTO = {
diff --git a/backend/src/services/auth/auth-fns.ts b/backend/src/services/auth/auth-fns.ts
index 80fb0b325..4911cc258 100644
--- a/backend/src/services/auth/auth-fns.ts
+++ b/backend/src/services/auth/auth-fns.ts
@@ -44,3 +44,24 @@ export const validateSignUpAuthorization = (token: string, userId: string, valid
   if (decodedToken.authTokenType !== AuthTokenType.SIGNUP_TOKEN) throw new UnauthorizedError();
   if (decodedToken.userId !== userId) throw new UnauthorizedError();
 };
+
+export const enforceUserLockStatus = (isLocked: boolean, temporaryLockDateEnd?: Date | null) => {
+  if (isLocked) {
+    throw new UnauthorizedError({
+      name: "User Locked",
+      message:
+        "User is locked due to multiple failed login attempts. An email has been sent to you in order to unlock your account."
+    });
+  }
+
+  if (temporaryLockDateEnd) {
+    const timeDiff = new Date().getTime() - temporaryLockDateEnd.getTime();
+    if (timeDiff < 0)
+      throw new UnauthorizedError({
+        name: "User Locked",
+        message: `User is locked due to multiple failed login attempts. Try logging in again after ${Math.round(
+          (-1 * timeDiff) / 1000
+        )} seconds.`
+      });
+  }
+};
diff --git a/backend/src/services/auth/auth-login-service.ts b/backend/src/services/auth/auth-login-service.ts
index 4d2a302c6..96c32c0df 100644
--- a/backend/src/services/auth/auth-login-service.ts
+++ b/backend/src/services/auth/auth-login-service.ts
@@ -13,7 +13,8 @@ import { TokenType } from "../auth-token/auth-token-types";
 import { TOrgDALFactory } from "../org/org-dal";
 import { SmtpTemplates, TSmtpService } from "../smtp/smtp-service";
 import { TUserDALFactory } from "../user/user-dal";
-import { validateProviderAuthToken } from "./auth-fns";
+import { processFailedMfaAttempt } from "../user/user-fns";
+import { enforceUserLockStatus, validateProviderAuthToken } from "./auth-fns";
 import {
   TLoginClientProofDTO,
   TLoginGenServerPublicKeyDTO,
@@ -212,6 +213,9 @@ export const authLoginServiceFactory = ({
     });
     // send multi factor auth token if they it enabled
     if (userEnc.isMfaEnabled && userEnc.email) {
+      const user = await userDAL.findById(userEnc.userId);
+      enforceUserLockStatus(user.isLocked, user.temporaryLockDateEnd);
+
       const mfaToken = jwt.sign(
         {
           authMethod,
@@ -300,6 +304,7 @@ export const authLoginServiceFactory = ({
   const resendMfaToken = async (userId: string) => {
     const user = await userDAL.findById(userId);
     if (!user || !user.email) return;
+    enforceUserLockStatus(user.isLocked, user.temporaryLockDateEnd);
     await sendUserMfaCode({
       userId: user.id,
       email: user.email
@@ -311,17 +316,51 @@ export const authLoginServiceFactory = ({
    * Third step of login in which user completes with mfa
    * */
   const verifyMfaToken = async ({ userId, mfaToken, mfaJwtToken, ip, userAgent, orgId }: TVerifyMfaTokenDTO) => {
-    await tokenService.validateTokenForUser({
-      type: TokenType.TOKEN_EMAIL_MFA,
-      userId,
-      code: mfaToken
-    });
+    const appCfg = getConfig();
+    const user = await userDAL.findById(userId);
+    enforceUserLockStatus(user.isLocked, user.temporaryLockDateEnd);
+
+    try {
+      await tokenService.validateTokenForUser({
+        type: TokenType.TOKEN_EMAIL_MFA,
+        userId,
+        code: mfaToken
+      });
+    } catch (err) {
+      const updatedUser = await processFailedMfaAttempt(userId, userDAL);
+      if (updatedUser.isLocked) {
+        if (updatedUser.email) {
+          const unlockToken = await tokenService.createTokenForUser({
+            type: TokenType.TOKEN_USER_UNLOCK,
+            userId: updatedUser.id
+          });
+
+          await smtpService.sendMail({
+            template: SmtpTemplates.UnlockAccount,
+            subjectLine: "Unlock your Infisical account",
+            recipients: [updatedUser.email],
+            substitutions: {
+              token: unlockToken,
+              callback_url: `${appCfg.SITE_URL}/api/v1/user/${updatedUser.id}/unlock-verify`
+            }
+          });
+        }
+      }
+
+      throw err;
+    }
 
     const decodedToken = jwt.verify(mfaJwtToken, getConfig().AUTH_SECRET) as AuthModeMfaJwtTokenPayload;
 
     const userEnc = await userDAL.findUserEncKeyByUserId(userId);
     if (!userEnc) throw new Error("Failed to authenticate user");
 
+    // reset lock states
+    await userDAL.updateById(userId, {
+      consecutiveFailedMfaAttempts: 0,
+      temporaryLockDateEnd: null
+    });
+
     const token = await generateUserTokens({
       user: {
         ...userEnc,
diff --git a/backend/src/services/smtp/smtp-service.ts b/backend/src/services/smtp/smtp-service.ts
index 81680537d..7d6b98b31 100644
--- a/backend/src/services/smtp/smtp-service.ts
+++ b/backend/src/services/smtp/smtp-service.ts
@@ -21,6 +21,7 @@ export enum SmtpTemplates {
   EmailVerification = "emailVerification.handlebars",
   SecretReminder = "secretReminder.handlebars",
   EmailMfa = "emailMfa.handlebars",
+  UnlockAccount = "unlockAccount.handlebars",
   AccessApprovalRequest = "accessApprovalRequest.handlebars",
   HistoricalSecretList = "historicalSecretLeakIncident.handlebars",
   NewDeviceJoin = "newDevice.handlebars",
diff --git a/backend/src/services/smtp/templates/unlockAccount.handlebars b/backend/src/services/smtp/templates/unlockAccount.handlebars
new file mode 100644
index 000000000..cb1859e51
--- /dev/null
+++ b/backend/src/services/smtp/templates/unlockAccount.handlebars
@@ -0,0 +1,16 @@
+<html>
+
+  <head>
+    <meta charset="utf-8" />
+    <meta http-equiv="x-ua-compatible" content="ie=edge" />
+    <title>Your Infisical account has been locked</title>
+  </head>
+
+  <body>
+    <h2>Unlock your Infisical account</h2>
+    <p>Your account has been temporarily locked due to multiple failed login attempts. </h2>
+    <a href="{{callback_url}}?token={{token}}">Unlock your account now</a>
+    <p>If these attempts were not made by you, reset your password immediately.</p>
+  </body>
+
+</html>
\ No newline at end of file
diff --git a/backend/src/services/user/user-fns.ts b/backend/src/services/user/user-fns.ts
index 639320e24..2750bb87e 100644
--- a/backend/src/services/user/user-fns.ts
+++ b/backend/src/services/user/user-fns.ts
@@ -1,5 +1,7 @@
 import slugify from "@sindresorhus/slugify";
 
+import { TableName } from "@app/db/schemas";
+import { DatabaseError } from "@app/lib/errors";
 import { alphaNumericNanoId } from "@app/lib/nanoid";
 import { TUserDALFactory } from "@app/services/user/user-dal";
 
@@ -19,3 +21,54 @@ export const normalizeUsername = async (username: string, userDAL: Pick<TUserDAL
     }
   }
 };
+
+export const processFailedMfaAttempt = async (userId: string, userDAL: Pick<TUserDALFactory, "transaction">) => {
+  try {
+    const updatedUser = await userDAL.transaction(async (tx) => {
+      const PROGRESSIVE_DELAY_INTERVAL = 3;
+      const [user] = await tx(TableName.Users)
+        .where("id", userId)
+        .increment("consecutiveFailedMfaAttempts", 1)
+        .returning("*");
+
+      if (!user) {
+        throw new Error("User not found");
+      }
+
+      const progressiveDelaysInMins = [5, 30, 60];
+
+      // lock user when failed attempt exceeds threshold
+      if (user.consecutiveFailedMfaAttempts > PROGRESSIVE_DELAY_INTERVAL * progressiveDelaysInMins.length) {
+        return (
+          await tx(TableName.Users)
+            .where("id", userId)
+            .update({
+              isLocked: true,
+              temporaryLockDateEnd: null
+            })
+            .returning("*")
+        )[0];
+      }
+
+      // delay user only when failed MFA attempts is a multiple of configured delay interval
+      if (user.consecutiveFailedMfaAttempts % PROGRESSIVE_DELAY_INTERVAL === 0) {
+        const delayIndex = user.consecutiveFailedMfaAttempts / PROGRESSIVE_DELAY_INTERVAL - 1;
+
+        return (
+          await tx(TableName.Users)
+            .where("id", userId)
+            .update({
+              temporaryLockDateEnd: new Date(new Date().getTime() + progressiveDelaysInMins[delayIndex] * 60 * 1000)
+            })
+            .returning("*")
+        )[0];
+      }
+
+      return user;
+    });
+
+    return updatedUser;
+  } catch (error) {
+    throw new DatabaseError({ error, name: "Process failed MFA Attempt" });
+  }
+};
diff --git a/backend/src/services/user/user-service.ts b/backend/src/services/user/user-service.ts
index 089f3b8c6..a82259db6 100644
--- a/backend/src/services/user/user-service.ts
+++ b/backend/src/services/user/user-service.ts
@@ -207,6 +207,19 @@ export const userServiceFactory = ({
     return userAction;
   };
 
+  const unlockUser = async (userId: string, token: string) => {
+    await tokenService.validateTokenForUser({
+      userId,
+      code: token,
+      type: TokenType.TOKEN_USER_UNLOCK
+    });
+
+    await userDAL.update(
+      { id: userId },
+      { consecutiveFailedMfaAttempts: 0, isLocked: false, temporaryLockDateEnd: null }
+    );
+  };
+
   return {
     sendEmailVerificationCode,
     verifyEmailVerificationCode,
@@ -216,6 +229,7 @@ export const userServiceFactory = ({
     deleteMe,
     getMe,
     createUserAction,
-    getUserAction
+    getUserAction,
+    unlockUser
   };
 };