CVE-2026-30229

Description

### 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

How to fix CVE-2026-30229

To remediate CVE-2026-30229, upgrade the affected package to a fixed version below.

• —upgrade to 9.5.0 or later
• —upgrade to 8.6.6 or later

Is CVE-2026-30229 being exploited?

Low — EPSS is 0.0%, meaning exploitation activity has not been observed at scale.

Affected packages (2)

• from 0, < 9.5.0
• from 0, < 8.6.6

CVSS scores

References (5)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2026-30229
• PATCHgithub.com/parse-community/parse-server
• WEBgithub.com/parse-community/parse-server/releases/tag/8.6.6
• WEBgithub.com/parse-community/parse-server/releases/tag/9.5.0-alpha.4