GitHub Advisoryadvisory · npm
GHSA-79wj-8rqv-jvp5 parse-server's endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user
HIGH
Official page ↗
- Aliases
- CVE-2026-30229
- Ecosystem
- npm
- Packages
- parse-server
- Severity
- High
- CVSS vector
- CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- Weaknesses
- CWE-863
- Reviewed
- 2026-03-06
Affected packages
• npm parse-server: < 8.6.6 → fixed in 8.6.6
• npm parse-server: >= 9.0.0, < 9.5.0-alpha.4 → fixed in 9.5.0-alpha.4
Description
Impact
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.
Patches
The fix adds a check to the `/logInAs` handler.
Workarounds
There is no workaround other than not using `readOnlyMasterKey`.
References
• GitHub security advisory: https://github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5
• Fix for Parse Server 9: https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4
• Fix for Parse Server 8: https://github.com/parse-community/parse-server/releases/tag/8.6.6
Related
Alias · CVE (1)
- CVE-2026-30229 Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. vulnerability
Weakness · CWE (1)
- CWE-863 Incorrect Authorization weakness
References
- https://github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5 web
- https://nvd.nist.gov/vuln/detail/CVE-2026-30229 advisory
- https://github.com/parse-community/parse-server package
- https://github.com/parse-community/parse-server/releases/tag/8.6.6 web
- https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4 web