CVE-2026-30229
High
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.
SeverityHigh
CVSS7.2
Exploit probability—
ProductParseplatform Parse-server
PublishedMar 6, 2026
First seenMar 6, 2026
Weakness typeCWE-863Incorrect authorization
How to fix
Update
- parseplatform parse-server8.6.6 or later
- parse-server8.6.6, 9.5.0-alpha.4 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| parseplatform parse-server | v < 8.6.6, 9.0.0 ≤ v ≤ 9.4.1, 9.5.0 | 8.6.6 |
| parse-servernpm | v < 8.6.6, 9.0.0 ≤ v < 9.5.0-alpha.4 | 8.6.6, 9.5.0-alpha.4 |
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