What’s Vulnerable › Vulnerabilities

CVE-2026-30228: Parse Server: File creation and deletion bypasses `readOnlyMasterKey` write restriction

• Severity: medium (CVSS 4.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-06 · updated 2026-06-17
• Weakness: CWE-863

Description

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.5 and 9.5.0-alpha.3, the readOnlyMasterKey can be used to create and delete files via the Files API (POST /files/:filename, DELETE /files/:filename). This bypasses the read-only restriction which violates the access scope of the readOnlyMasterKey. Any Parse Server deployment that uses readOnlyMasterKey and exposes the Files API is affected. An attacker with access to the readOnlyMasterKey can upload arbitrary files or delete existing files. This issue has been patched in versions 8.6.5 and 9.5.0-alpha.3.

Affected products

• parse-community parse-server: before 8.6.5; from 9.0.0 through 9.4.1; 9.5.0-alpha1, 9.5.0-alpha2 — fixed in 8.6.5

How to fix

Upgrade to a fixed version: parse-community parse-server 8.6.5. Check the vendor advisory for mitigations.

References

• https://github.com/parse-community/parse-server/releases/tag/8.6.5
• https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.3
• https://github.com/parse-community/parse-server/security/advisories/GHSA-xfh7-phr7-gr2x

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