CVE-2021-39187: Parseplatform Parse-Server

High severity, CVSS 7.5. EPSS: 1.8% chance of exploitation in the next 30 days.

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to version 4.10.3, Parse Server crashes when if a query request contains an invalid value for the `explain` option. This is due to a bug in the MongoDB Node.js driver which throws an exception that Parse Server cannot catch. There is a patch for this issue in version 4.10.3. No workarounds aside from upgrading are known to exist.

Affected products

• Parseplatform Parse-Server: before 4.10.3 (fixed in 4.10.3)

Published 2021-09-02. Last modified 2026-06-17.