CVE-2026-34373: Parseplatform Parse-Server

High severity, CVSS 8.8. EPSS: 0.2% 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 versions 8.6.66 and 9.7.0-alpha.10, the GraphQL API endpoint does not respect the allowOrigin server option and unconditionally allows cross-origin requests from any website. This bypasses origin restrictions that operators configure to control which websites can interact with the Parse Server API. The REST API correctly enforces the configured allowOrigin restriction. This issue has been patched in versions 8.6.66 and 9.7.0-alpha.10.

Affected products

• Parseplatform Parse-Server: from 3.5.0, before 8.6.66 (fixed in 8.6.66); from 9.0.0, before 9.7.0 (fixed in 9.7.0); version 9.7.0 only

Published 2026-03-31. Last modified 2026-07-24.