---
title: "Security Disclosure Recommendation: Rotate MongoDB Database Credentials"
description: "Learn how to Security Disclosure Recommendation: Rotate MongoDB Database Credentials"
date: 2026-10-22T00:46:25.715Z
authors: ["Mykal Machon"]
category: "Engineering"
url: https://blog.railway.com/p/security-disclosure-recommendation-rotate-mongodb-database-credentials
---

# Security Disclosure Recommendation: Rotate MongoDB Database Credentials

> This guide is part of Railway's response [to the security disclosure published on October 21, 2026](https://blog.railway.com/p/security-disclosure-wednesday-october-21st).

*If you use MongoDB on Railway, regenerate its password, redeploy every service that uses it, and confirm nothing is still connecting with the old credential.*

If your MongoDB password or `MONGO_URL` may have been exposed, rotate your credentials. This guide applies if your database uses the Railway [MongoDB template](https://docs.railway.com/databases/mongodb). The fastest path is **Regenerate** in the Database View, which changes the password inside MongoDB and updates the service variables in one step.

## Before you rotate

Three checks tell you how exposed the credential is and what you must update afterwards.

1. Find every consumer. Open the MongoDB service's **Variables** tab. Services that use [reference variables](https://docs.railway.com/variables#referencing-another-services-variable) such as `${{ MongoDB.MONGO_URL }}` pick up the new password on their next deploy. Services with a pasted connection string don't update.
2. Check public access. Open the MongoDB service's **Settings** and find **Networking**. If **Public Access** is enabled, the credential is usable from anywhere through the [TCP proxy](https://docs.railway.com/networking/tcp-proxy) until you rotate. Remove public access now if nothing outside the project needs it.
3. List external consumers. Anything that uses `MONGO_PUBLIC_URL` needs the new value manually.

## Regenerate the password

Regenerate is the supported way to change a database password on Railway. It keeps the database and the variables in sync.

1. Open the MongoDB service and click the **Database** tab, then **Config**.
2. In the **Connection** section, click **Regenerate** next to the password. Railway changes the password inside MongoDB. See [Database View: Connection](https://docs.railway.com/databases/database-view#connection).
3. Expect new connections with the old password to fail from this point.

> ⚠️ Don't edit `MONGOPASSWORD` or `MONGO_INITDB_ROOT_PASSWORD` by hand and don't run `db.changeUserPassword()` yourself. Each changes only one side and leaves the variable and the database out of sync. If that already happened, see [how to recover](https://docs.railway.com/databases/database-view#connection).

## Redeploy the services that use it

Containers read variables only at startup, so every service that uses the credential must be redeployed.

1. Redeploy every service that references the MongoDB variables. Regenerate redeploys only the database, so these services keep the old password until you do.
2. If a service has a pasted connection string, replace it with the reference `${{ MongoDB.MONGO_URL }}` so the next rotation reaches it automatically, then deploy.
3. Update external consumers with the new `MONGO_PUBLIC_URL`.

## Verify the rotation

Confirm the new credential works and nothing is still connected with the old one.

1. Check each dependent service's deploy logs for no `Authentication failed` errors.
2. Open the **Database** tab and confirm the **Data** view lists collections.
3. Connect with the new credential using [`railway connect`](https://docs.railway.com/cli/connect).
   ```Shell
   railway connect MongoDB

   ```
4. List active operations and sessions, and look for clients you don't recognize.
   ```JavaScript
   db.currentOp(true).inprog.map(op => ({
     client: op.client,
     users: op.effectiveUsers,
     desc: op.desc,
     active: op.active,
   }));
   db.getSiblingDB("config").system.sessions.aggregate([
     { $listSessions: { allUsers: true } },
   ]);

   ```
5. End a suspicious operation with `db.killOp(<opid>)` or a session with `db.runCommand({ killSessions: [{ id: <uuid> }] })`.

## Look for misuse

A rotated password stops future access. These checks show whether the old credential was used.

- Inside MongoDB, look for users you didn't create with `db.getSiblingDB("admin").getUsers()`.
- Compare collection counts and the most recent documents (`db.orders.find().sort({ _id: -1 }).limit(20)`) against what you expect.
- If data was altered, preserve the evidence first, then restore from a [backup](https://docs.railway.com/volumes/backups) taken before the exposure.

If you have any other questions, contact Railway support at <support@railway.com>.


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