CVE-2026-30229
parse-server's endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user
Impact
### 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
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | parse-server | < 8.6.6 | 8.6.6 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Parseplatform | Parse-Server | before 8.6.6 from 9.0.0 through 9.4.1 Version 9.5.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- 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
- https://github.com/parse-community/parse-server/security/advisories/GHSA-79wj-8rqv-jvp5
- https://github.com/advisories/GHSA-79wj-8rqv-jvp5
- https://nvd.nist.gov/vuln/detail/CVE-2026-30229