CVE-2026-34373: Parse Server: GraphQL API endpoint ignores CORS origin restriction
Impact
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.
Patches
The GraphQL API endpoint now uses the same CORS middleware as the REST API, ensuring the allowOrigin and allowHeaders server options are consistently enforced across all endpoints.
Workarounds
There is no known workaround other than upgrading.
Resources
- GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-q3p6-g7c4-829c - Fix Parse Server 9: https://github.com/parse-community/parse-server/pull/10334 - Fix Parse Server 8: https://github.com/parse-community/parse-server/pull/10335
Other sources
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.
— MITRE
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
npm/parse-serverto a version that resolves this vulnerability.Fixed in 8.6.66 - Upgrade
Upgrade
npm/parse-serverto a version that resolves this vulnerability.Fixed in 9.7.0-alpha.10 - Upgrade
Upgrade
Parse Serverto a version that resolves this vulnerability.Fixed in 8.6.66 - Upgrade
Upgrade
Parse Serverto a version that resolves this vulnerability.Fixed in 9.7.0-alpha.10
Event History
Frequently Asked Questions
What is the severity of CVE-2026-34373?
CVE-2026-34373 is considered a high-severity vulnerability due to its potential for cross-origin request forgery.
How do I fix CVE-2026-34373?
To fix CVE-2026-34373, upgrade to Parse Server version 8.6.66 or 9.7.0-alpha.10.
What type of vulnerability is CVE-2026-34373?
CVE-2026-34373 is a cross-origin resource sharing (CORS) vulnerability affecting the GraphQL API.
What systems are affected by CVE-2026-34373?
CVE-2026-34373 affects npm packages of Parse Server versions between 3.5.0 and 8.6.66, as well as versions from 9.0.0 to 9.7.0-alpha.10.
How does CVE-2026-34373 impact security?
CVE-2026-34373 compromises security by allowing unauthorized cross-origin requests, potentially enabling data theft or manipulation.