PT-2026-29272 · Parse Community · Parse Server

Published 2026-03-31 · Updated 2026-03-31 · CVE-2026-34532

NVD

CVSS v4.0

9.1

Critical

AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.67 and 9.7.0-alpha.11, an attacker can bypass Cloud Function validator access controls by appending "prototype.constructor" to the function name in the URL. When a Cloud Function handler is declared using the function keyword and its validator is a plain object or arrow function, the trigger store traversal resolves the handler through its own prototype chain while the validator store fails to mirror this traversal, causing all access control enforcement to be skipped. This allows unauthenticated callers to invoke Cloud Functions that are meant to be protected by validators such as requireUser, requireMaster, or custom validation logic. This issue has been patched in versions 8.6.67 and 9.7.0-alpha.11.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-34532

Affected Products

Parse Server

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2026-34532 · Security Note
• https://github.com/parse-community/parse-server/commit/dc59e272665644083c5b7f6862d88ce1ef0b2674 · Note
• https://github.com/parse-community/parse-server/commit/4fc48cf28f22eea200d74d883505f485234a48d7 · Note
• https://github.com/parse-community/parse-server/pull/10343 · Note
• https://github.com/parse-community/parse-server/security/advisories/GHSA-vpj2-qq7w-5qq6 · Note
• https://github.com/parse-community/parse-server/pull/10342 · Note