Medium severity · published Mar 6, 2026
CVE-2026-30228
Parse Server: File creation and deletion bypasses `readOnlyMasterKey` write restriction
4.9
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
Attack vector
Network
Complexity
Low
Privileges
High
User interaction
None
Confidentiality
None
Integrity
High
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 28% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
PA
parse-server · parse-community
< 8.6.5; < 9.5.0-alpha.3 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-30228
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-30228
Product
https://github.com/parse-community/parse-server/releases/tag/8.6.5
Product
https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.3
Vendor Advisory
https://github.com/parse-community/parse-server/security/advisories/GHSA-xfh7-phr7-gr2x
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