CVE
CVE-2026-30229
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 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
Package Versions Affected
Package Version
patch Availability
No items found.
Automatically patch vulnerabilities without upgrading
Fix Without Upgrading
Detect compatible fix
Apply safe remediation
Fix with a single pull request
CVSS Version
Severity
Base Score
CVSS Version
Score Vector
C
H
U
8.5
-
4.0
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
C
H
U
0
-
C
H
U
8.7
-
3.1
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
Related Resources
No items found.
References
https://github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5, https://nvd.nist.gov/vuln/detail/CVE-2026-30229, https://github.com/parse-community/parse-server, https://github.com/parse-community/parse-server/releases/tag/8.6.6, https://github.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4
Basic Information
Ecosystem
