Vulnerability · Published Mar 6, 2026 · Assigned by GitHub_M

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

Medium 6.9

In plain English

A medium-severity incorrect authorization in parse-server from parse-community. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 30% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 4.0)6.9Medium

Exploit odds (30 days)0.4%top 69.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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 packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
npm	parse-server	9.5.0-alpha.3	GHSA-xfh7-phr7-gr2x
npm	parse-server	8.6.5	GHSA-xfh7-phr7-gr2x

Affected products (as reported)

Vendor	Product	Versions
parse-community	parse-server	< 8.6.5< 9.5.0-alpha.3

Weakness: CWE-863 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

References

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