CVE-2026-34373

Description

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, 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.

How to fix CVE-2026-34373

To remediate CVE-2026-34373, upgrade the affected package to a fixed version below.

• —upgrade to 8.6.66 or later
• —upgrade to 9.7.0-alpha.10 or later

Is CVE-2026-34373 being exploited?

Low — EPSS is 0.2%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 8.6.66, >= 9.0.0, < 9.7.0
• >= 9.0.0, < 9.7.0-alpha.10

CVSS scores

References (7)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-34373
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/commit/0347641507891d0013ec57f7c10f012064f41263
• WEBgithub.com/parse-community/parse-server/commit/4dd0d3d8be1c39664c74ad10bb0abaa76bc41203