CVE-2026-34595 Parse Server: LiveQuery protected-field guard bypass via array-like logical operator value
Authenticated users can bypass protected field restrictions in LiveQuery subscriptions to infer sensitive data values via a binary oracle.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-34595?
CVE-2026-34595 is a medium-severity vulnerability in Parseplatform Parse-Server, published on 31 Mar 2026. Any signed-in user can exploit it over the network, 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 8.6.70 and 9.7.0-alpha.18, an authenticated user with find class-level permission can bypass the protectedFields class-level permission setting on LiveQuery subscriptions. By sending a subscription with a $or, $and, or $nor operator value as a plain object with numeric keys and a length property (an "array-like" object) instead of an array, the protected-field guard is bypassed. The subscription event firing acts as a binary oracle, allowing the attacker to infer whether a protected field matches a given test value. This issue has been patched in versions 8.6.70 and 9.7.0-alpha.18.
Weakness: CWE-843
Which versions are affected by CVE-2026-34595?
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 | 8.6.70 |
parse-server npm | All versions | 8.6.70 |
parse-server npm | From 9.0.0 | 9.7.0-alpha.16 |
parse-server npm | From 9.0.0 | 9.7.0-alpha.16 |
parse Bitnami | All versions | 8.6.70, 9.7.0 |
Products include Parseplatform Parse-Server.
How do I fix CVE-2026-34595?
Upgrade parse-server to a fixed version for your release line: 8.6.70 or 9.7.0-alpha.16.
Is CVE-2026-34595 being exploited?
There is no known exploitation of CVE-2026-34595 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-2026-34595, GHSA-mmg8-87c5-jrc2.