Prototype pollution in Parse Server - CVE-2026-30939
Published: April 6, 2026
Vulnerability identifier: #VU124976
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-30939
CWE-ID: CWE-1321
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Parse Community
Affected software:
Parse Server
Parse Server
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improperly controlled modification of object prototype attributes in the Cloud Function endpoint dispatch logic when handling a Cloud Function request with a prototype property name as the function name. A remote attacker can send a specially crafted request to cause a denial of service.
Requests using other prototype property names or dot-notation traversal may bypass Cloud Function dispatch validation and return HTTP 200 responses even when no such Cloud Functions are defined.
How to mitigate CVE-2026-30939
Install security update from vendor's website.