NoSQL Injection in PenguinMod-BackendApi Password Reset

Executive Summary

CVE-2026-47181 is a NoSQL injection vulnerability in the password reset endpoint of PenguinMod-BackendApi versions before 1.0.0.

This flaw allows any authenticated user to change the password of another account, leading to full account takeover.

The attacker only needs a registered account and a valid password reset token for their own account.

The vulnerability exists because the reset endpoint accepts the email field from the POST body without proper type validation, passing it directly to MongoDB queries.

This allows an attacker to inject NoSQL queries, such as using the $regex operator, to manipulate the queries and change an arbitrary user's password.

The attack can be executed by registering an account, requesting a password reset, and then sending a crafted POST request to the reset endpoint with the injected email field.

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Impact Analysis

This vulnerability allows any authenticated user to take over any account without knowing the target's email or password.

The affected user is locked out of their account, and the attacker gains full control.

• The attacker could gain admin access.
• The attacker could delete accounts.
• The attacker could ban users.
• The attacker could delete projects.

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Detection Guidance

This vulnerability can be detected by monitoring for unusual POST requests to the password reset endpoint that include suspicious or crafted email fields containing NoSQL injection payloads such as the $regex operator.

One way to detect exploitation attempts is to analyze logs for password reset requests where the email parameter contains unexpected query operators or patterns.

Example commands to detect such activity might include:

• Using grep to find suspicious POST requests in web server logs: grep -i 'password-reset' /var/log/nginx/access.log | grep -E '\$regex|\$ne|\$gt|\$lt'
• Using a network packet capture tool like tcpdump or Wireshark to filter HTTP POST requests to the reset endpoint and inspect the email field for injection patterns.
• Review application logs for password reset attempts with unusual email field values.

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Mitigation Strategies

The immediate mitigation step is to upgrade PenguinMod-BackendApi to version 1.0.0 or later, where this NoSQL injection vulnerability has been patched.

Until the upgrade can be applied, restrict access to the password reset endpoint to trusted users only, and implement input validation and sanitization on the email field to prevent injection of NoSQL operators.

Additionally, monitor for suspicious password reset activity and consider temporarily disabling password reset functionality if possible.

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Compliance Impact

The vulnerability allows any authenticated user to take over any account by exploiting a NoSQL injection in the password reset endpoint, leading to unauthorized access and potential full account takeover.

Such unauthorized access and account takeover can lead to breaches of confidentiality and integrity of user data, which may violate compliance requirements under standards like GDPR and HIPAA that mandate protection of personal and sensitive information.

Specifically, GDPR requires organizations to implement appropriate security measures to protect personal data against unauthorized access, and HIPAA mandates safeguards to ensure the confidentiality, integrity, and availability of protected health information.

Failure to patch this vulnerability could result in non-compliance due to inadequate access controls and insufficient input validation, increasing the risk of data breaches and potential regulatory penalties.

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