CVE-2026-34532 Parse Server: Cloud function validator bypass via prototype chain traversal
Attackers can bypass Cloud Function access controls by manipulating function names, allowing unauthenticated execution of protected backend logic.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34532?
CVE-2026-34532 is a critical authentication bypass vulnerability in Parseplatform Parse-Server, published on 31 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
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.
Weakness: CWE-863
Which versions are affected by CVE-2026-34532?
5 open source packages ship an affected version, including parse-server and parse. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
parse-server npm | All versions | 8.6.67 |
parse-server npm | All versions | 8.6.67 |
parse-server npm | From 9.0.0 | 9.7.0-alpha.11 |
parse-server npm | From 9.0.0 | 9.7.0-alpha.11 |
parse Bitnami | All versions | 8.6.67, 9.7.0 |
Products include Parseplatform Parse-Server.
How do I fix CVE-2026-34532?
Upgrade parse-server to a fixed version for your release line: 8.6.67 or 9.7.0-alpha.11.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2026-34532 being exploited?
There is no known exploitation of CVE-2026-34532 in the wild and no public exploit code.
Other vulnerabilities in Parseplatform Parse-Server
- CVE-2026-30966 Parse Server role escalation and CLP bypass via direct `_Join` table write
- CVE-2024-27298 Parse Server literalizeRegexPart SQL Injection
- CVE-2022-24760 Command Injection in Parse server
- CVE-2026-30965 Parse Server session token exfiltration via `redirectClassNameForKey` query parameter
- CVE-2023-36475 Parse Server vulnerable to remote code execution via MongoDB BSON parser through prototype pollution
Sources
Also known as BIT-parse-2026-34532, GHSA-vpj2-qq7w-5qq6.