CVE-2026-30229 Parse Server: Endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user

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...

CVE-2026-30229

CVE-2026-30229 affects Parse Server. The readOnlyMasterKey could call POST /loginAs to obtain a valid session token, allowing impersonation of arbitrary users with full read/write access. Impact applies to any deployment using readOnlyMasterKey. The issue is resolved in Parse Server releases 8.6....

CVE-2026-30229 Parse Server: Endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user

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...

Incorrect Authorization

Overview parse-server is a version of the Parse backend that can be deployed to any infrastructure that can run Node.js. Affected versions of this package are vulnerable to Incorrect Authorization via the /loginAs endpoint when using the readOnlyMasterKey credential. An attacker can impersonate...

EUVD-2026-10060

parse-server's endpoint /loginAs allows readOnlyMasterKey to gain full read and write access as any user...

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

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...