High severityNVD Advisory· Published Mar 6, 2026· Updated Mar 9, 2026
Parse Server: Endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user
CVE-2026-30229
Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.6 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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
parse-servernpm | < 8.6.6 | 8.6.6 |
parse-servernpm | >= 9.0.0, < 9.5.0-alpha.4 | 9.5.0-alpha.4 |
Affected products
3- osv-coords2 versions
< 9.5.0+ 1 more
- (no CPE)range: < 9.5.0
- (no CPE)range: < 8.6.6
- Range: < 8.6.6
Patches
Vulnerability mechanics
References
5- github.com/advisories/GHSA-79wj-8rqv-jvp5ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-30229ghsaADVISORY
- github.com/parse-community/parse-server/releases/tag/8.6.6ghsax_refsource_MISCWEB
- github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4ghsax_refsource_MISCWEB
- github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5ghsax_refsource_CONFIRMWEB
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