CVE-2026-34532
CriticalCVSS 9.1Exploitation Probability (EPSS)
Low risk20th percentile - higher than 20% of all known CVEs
Summary
Parse Server prior to versions 8.6.67 and 9.7.0-alpha.11 has a vulnerability where an attacker can bypass Cloud Function validator access controls by appending "prototype.constructor" to the function name in the URL. This causes all access control enforcement to be skipped, allowing unauthenticated callers to invoke protected Cloud Functions.
Risk Assessment
Unauthenticated attackers can invoke Cloud Functions that should be protected, potentially leading to unauthorized data access or sensitive operations.
Recommendation
Update to version 8.6.67 or 9.7.0-alpha.11.
Original NVD description (English source)
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.