CVE-2026-30229: parse-server's endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user

March 6, 2026

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.

References

github.com/advisories/GHSA-79wj-8rqv-jvp5
github.com/parse-community/parse-server
github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5
nvd.nist.gov/vuln/detail/CVE-2026-30229

Code Behaviors & Features

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