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The vulnerability, CVE-2026-3431, is a critical missing authorization flaw in SimStudio versions before 0.5.74 . The issue resides within the application’s MongoDB tool endpoints, which are designed to facilitate database interactions . These endpoints improperly accept arbitrary connection parameters from any caller without requiring authentication or enforcing host-based restrictions . An unauthenticated, remote attacker can exploit this by sending crafted requests to these endpoints, supplying a connection string for any MongoDB instance they wish to target . Because the SimStudio application fails to validate these parameters, it acts as a proxy, establishing a connection to the attacker-specified database . Once the connection is made, the attacker can leverage the SimStudio application’s database privileges to perform unauthorized operations on the remote MongoDB instance, including reading, modifying, or deleting all data contained within it . This effectively grants the attacker full control over the targeted database through the vulnerable application, leading to a complete compromise of data confidentiality, integrity, and availability . The attack vector is over the network, requires no user interaction, and has a high impact, earning it a CVSS base score of 9.8 (Critical) .
dailycve form:
Platform: SimStudio
Version: below 0.5.74
Vulnerability : Missing Authorization
Severity: Critical
date: 2026-03-02
Prediction: 2026-03-16
What Undercode Say:
Analytics:
Vulnerability was published on March 2, 2026, by Tenable Research . It has a CVSS v3.1 base score of 9.8 (Critical) with the vector AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H . The primary weakness is CWE-862 (Missing Authorization) . The vulnerability is present in all SimStudio versions before 0.5.74 . Public disclosure occurred on March 2, 2026, with no evidence of active exploitation in the wild as of March 6 .
Bash Commands and Codes:
The following commands demonstrate how an attacker might exploit the missing authorization to perform unauthorized operations.
Example 1: Using curl to exploit the vulnerable MongoDB tool endpoint.
This command sends a POST request with a malicious connection string.
Replace <target-simstudio> with the vulnerable SimStudio host and port.
Replace <attacker-mongo-db> with the attacker-controlled or target MongoDB instance.
curl -X POST http://<target-simstudio>/vulnerable-mongo-endpoint \
-H "Content-Type: application/json" \
-d '{
"connection_string": "mongodb://<attacker-mongo-db>:27017/admin",
"command": "db.runCommand({ listDatabases: 1 })"
}'
Example 2: Using a Python script to interact with the vulnerable endpoint and delete data.
This script sends a request to drop a collection named 'users' on the target MongoDB.
import requests
import json
url = "http://<target-simstudio>/vulnerable-mongo-endpoint"
payload = {
"connection_string": "mongodb://<attacker-mongo-db>:27017/target_db",
"command": "db.users.drop()"
}
headers = {'Content-type': 'application/json'}
response = requests.post(url, data=json.dumps(payload), headers=headers)
print(response.text)
How Exploit:
The attacker sends an unauthenticated HTTP request to the SimStudio server containing a crafted MongoDB connection string in the JSON payload . The server accepts the arbitrary parameters without validation . SimStudio then establishes a connection to the attacker-specified MongoDB instance . The attacker sends further commands through the same channel to read, modify, or delete data on the remote MongoDB database .
Protection from this CVE:
Upgrade SimStudio to version 0.5.74 or later, which contains the fix . If an immediate upgrade is not possible, implement a Web Application Firewall (WAF) rule to block requests containing suspicious MongoDB connection strings to the vulnerable endpoints. Restrict network-level access to the SimStudio application from untrusted hosts. Perform input validation on the server to ensure only allowed, internal MongoDB hosts are accepted as connection parameters.
Impact:
Successful exploitation results in a full compromise of data confidentiality, integrity, and availability on the targeted MongoDB instance . An attacker can read all data, modify existing records, and delete entire databases . This can lead to severe data breaches, data loss, and potential service disruption for applications relying on the compromised database.
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Sources:
Reported By: nvd.nist.gov
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