Auth bypass in Parse-Community Parse-Server
CVE-2026-30228
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.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (34.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 35th percentile — 34.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Parse-Community Parse-Server — versions < 8.6.5, < 9.5.0-alpha.3
- Parseplatform Parse-Server — versions 9.5.0
Weakness classification (CWE)
References
- github.com/parse-community/parse-server/security/advisories/GHSA-xfh7-phr7-gr2x (Vendor Advisory)
- github.com/parse-community/parse-server/releases/tag/8.6.5 (Product, Release Notes)
- github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.3 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-30228?
- CVE-2026-30228 is a medium-severity vulnerability in Parse-Community Parse-Server, classified under Incorrect Authorization. CVSS score: 4.9/10. Published 2026-03-06.
- How severe is CVE-2026-30228?
- Medium severity. CVSS v3 base score is 4.9 out of 10.