Parse Server's Cloud Hooks and Cloud Jobs bypass `readOnlyMasterKey` write restriction

Description

Parse Server’s readOnlyMasterKey option allows access with master-level read privileges but is documented to deny all write operations. However, some endpoints incorrectly accept the readOnlyMasterKey for mutating operations.

Recommendation

Update the parse-server package to the latest compatible version. Followings are version details:

• Affected version(s): **<= 8.6.3

  >= 9.0.0, <= 9.4.1-alpha.2**

• Patched version(s): **8.6.4

  9.4.1-alpha.3**

References

• GHSA-vc89-5g3r-cmhh
• CVE-2026-29182
• CWE-863
• CAPEC-310
• OWASP 2021-A1
• OWASP 2021-A6

Related Issues

• parse-server's file creation and deletion bypasses `readOnlyMasterKey` write restriction - CVE-2026-30228
• Parse Server has Denial of Service (DoS) and Cloud Function Dispatch Bypass via Prototype Chain Resolution - CVE-2026-30939
• Parse Server has role escalation and CLP bypass via direct `_Join` table write - CVE-2026-30966
• parse-server's endpoint `/loginAs` allows `readOnlyMasterKey` to gain full read and write access as any user - CVE-2026-30229

Tags:

npm

parse-server