Auth bypass in Parse-Community Parse-Server
CVE-2026-30229
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.6 and 9.5.0-alpha.4, the readOnlyMasterKey can call POST /loginAs to obtain a valid session token for any user. This allows a read-only credential to impersonate arbitrary users with full read and write access to their data. Any Parse Server deployment that uses readOnlyMasterKey is affected. This issue has been patched in versions 8.6.6 and 9.5.0-alpha.4.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.006 (44.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.006 · change: +0.002
Affected products
- Parse-Community Parse-Server — versions < 8.6.6, < 9.5.0-alpha.4
- Parseplatform Parse-Server — versions 9.5.0
Weakness classification (CWE)
References
- github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5 (Vendor Advisory)
- github.com/parse-community/parse-server/releases/tag/8.6.6 (Product, Release Notes)
- github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-30229?
- CVE-2026-30229 is a high-severity vulnerability in Parse-Community Parse-Server, classified under Incorrect Authorization. CVSS score: 7.2/10. Published 2026-03-06.
- How severe is CVE-2026-30229?
- High severity. CVSS v3 base score is 7.2 out of 10.