CVE-2020-15270: Open Source Vulnerability in Parse Server

parse Updated 02 Oct 2025

Summary

06/03/2024

Disclosed on

CVE-2020-15270

CVE

Yes i

Fix available

Medium

Severity

Not published

CVSS Score

CVE-2020-15270: Improper session expiration in Parse Server. Affects parse versions < 4.3.1. Fixed in 4.3.1. How to fix ↓

Also tracked for

parse-server · npm

The same CVE-2020-15270 is tracked separately for each ecosystem and vendor. Its fix information is the same; the package and affected versions differ.

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Background

Parse Server is an npm package that provides a backend framework for building scalable and flexible applications. It is commonly used in conjunction with Node.js. This vulnerability affects the Parse Server package, specifically the broadcast events functionality. The package allows events to be broadcasted to all clients without verifying the validity of the session token. This means that clients with expired sessions can still receive subscription objects. It is important to note that subscription objects cannot be created with invalid session tokens. The vulnerability has not been patched yet.

Vulnerability Detail

The vulnerability in Parse Server allows clients with expired sessions to continue receiving subscription objects. This can lead to unauthorized access to sensitive information or the execution of unauthorized actions. The issue arises from the lack of validation of session tokens when broadcasting events. As a result, clients with expired sessions are not properly filtered out. The severity of this vulnerability is considered medium, with a CVSS v3 score of 3.1. It is recommended to address this vulnerability promptly to prevent potential security breaches.

How To Fix

Minimum fixed version

4.3.1

This is the first release that contains the fix.

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Workaround

Currently, there is no known workaround for this vulnerability. It is essential to update the Parse Server package to the patched version to mitigate the risk.

Conclusion

The vulnerability in Parse Server allows clients with expired sessions to receive subscription objects, potentially leading to unauthorized access or actions. It is crucial to update the Parse Server package to version 4.3.0 or later to mitigate this vulnerability. For further support on vulnerability remediation, please contact DevNack.com.

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